1094 lines
37 KiB
Python
Executable File
1094 lines
37 KiB
Python
Executable File
#!/usr/bin/env python2
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#
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# $Id: arc_summary.pl,v 388:e27800740aa2 2011-07-08 02:53:29Z jhell $
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#
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# Copyright (c) 2008 Ben Rockwood <benr@cuddletech.com>,
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# Copyright (c) 2010 Martin Matuska <mm@FreeBSD.org>,
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# Copyright (c) 2010-2011 Jason J. Hellenthal <jhell@DataIX.net>,
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# If you are having troubles when using this script from cron(8) please try
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# adjusting your PATH before reporting problems.
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#
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# Note some of this code uses older code (eg getopt instead of argparse,
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# subprocess.Popen() instead of subprocess.run()) because we need to support
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# some very old versions of Python.
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#
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"""Print statistics on the ZFS Adjustable Replacement Cache (ARC)
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Provides basic information on the ARC, its efficiency, the L2ARC (if present),
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the Data Management Unit (DMU), Virtual Devices (VDEVs), and tunables. See the
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in-source documentation and code at
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https://github.com/openzfs/zfs/blob/master/module/zfs/arc.c for details.
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"""
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import getopt
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import os
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import sys
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import time
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import errno
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from subprocess import Popen, PIPE
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from decimal import Decimal as D
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if sys.platform.startswith('freebsd'):
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# Requires py27-sysctl on FreeBSD
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import sysctl
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def load_kstats(namespace):
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"""Collect information on a specific subsystem of the ARC"""
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base = 'kstat.zfs.misc.%s.' % namespace
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return [(kstat.name, D(kstat.value)) for kstat in sysctl.filter(base)]
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def load_tunables():
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return dict((ctl.name, ctl.value) for ctl in sysctl.filter('vfs.zfs'))
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elif sys.platform.startswith('linux'):
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def load_kstats(namespace):
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"""Collect information on a specific subsystem of the ARC"""
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kstat = 'kstat.zfs.misc.%s.%%s' % namespace
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path = '/proc/spl/kstat/zfs/%s' % namespace
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with open(path) as f:
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entries = [line.strip().split() for line in f][2:] # Skip header
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return [(kstat % name, D(value)) for name, _, value in entries]
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def load_tunables():
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basepath = '/sys/module/zfs/parameters'
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tunables = {}
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for name in os.listdir(basepath):
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if not name:
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continue
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path = '%s/%s' % (basepath, name)
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with open(path) as f:
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value = f.read()
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tunables[name] = value.strip()
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return tunables
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show_tunable_descriptions = False
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alternate_tunable_layout = False
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def handle_Exception(ex_cls, ex, tb):
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if ex is IOError:
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if ex.errno == errno.EPIPE:
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sys.exit()
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if ex is KeyboardInterrupt:
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sys.exit()
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sys.excepthook = handle_Exception
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def get_Kstat():
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"""Collect information on the ZFS subsystem from the /proc virtual
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file system. The name "kstat" is a holdover from the Solaris utility
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of the same name.
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"""
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Kstat = {}
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Kstat.update(load_kstats('arcstats'))
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Kstat.update(load_kstats('zfetchstats'))
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Kstat.update(load_kstats('vdev_cache_stats'))
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return Kstat
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def fBytes(b=0):
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"""Return human-readable representation of a byte value in
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powers of 2 (eg "KiB" for "kibibytes", etc) to two decimal
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points. Values smaller than one KiB are returned without
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decimal points.
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"""
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prefixes = [
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[2**80, "YiB"], # yobibytes (yotta)
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[2**70, "ZiB"], # zebibytes (zetta)
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[2**60, "EiB"], # exbibytes (exa)
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[2**50, "PiB"], # pebibytes (peta)
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[2**40, "TiB"], # tebibytes (tera)
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[2**30, "GiB"], # gibibytes (giga)
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[2**20, "MiB"], # mebibytes (mega)
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[2**10, "KiB"]] # kibibytes (kilo)
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if b >= 2**10:
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for limit, unit in prefixes:
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if b >= limit:
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value = b / limit
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break
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result = "%0.2f\t%s" % (value, unit)
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else:
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result = "%d\tBytes" % b
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return result
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def fHits(hits=0):
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"""Create a human-readable representation of the number of hits.
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The single-letter symbols used are SI to avoid the confusion caused
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by the different "short scale" and "long scale" representations in
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English, which use the same words for different values. See
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https://en.wikipedia.org/wiki/Names_of_large_numbers and
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https://physics.nist.gov/cuu/Units/prefixes.html
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"""
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numbers = [
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[10**24, 'Y'], # yotta (septillion)
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[10**21, 'Z'], # zetta (sextillion)
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[10**18, 'E'], # exa (quintrillion)
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[10**15, 'P'], # peta (quadrillion)
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[10**12, 'T'], # tera (trillion)
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[10**9, 'G'], # giga (billion)
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[10**6, 'M'], # mega (million)
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[10**3, 'k']] # kilo (thousand)
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if hits >= 1000:
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for limit, symbol in numbers:
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if hits >= limit:
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value = hits/limit
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break
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result = "%0.2f%s" % (value, symbol)
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else:
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result = "%d" % hits
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return result
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def fPerc(lVal=0, rVal=0, Decimal=2):
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"""Calculate percentage value and return in human-readable format"""
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if rVal > 0:
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return str("%0." + str(Decimal) + "f") % (100 * (lVal / rVal)) + "%"
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else:
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return str("%0." + str(Decimal) + "f") % 100 + "%"
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def get_arc_summary(Kstat):
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"""Collect general data on the ARC"""
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output = {}
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memory_throttle_count = Kstat[
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"kstat.zfs.misc.arcstats.memory_throttle_count"
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]
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if memory_throttle_count > 0:
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output['health'] = 'THROTTLED'
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else:
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output['health'] = 'HEALTHY'
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output['memory_throttle_count'] = fHits(memory_throttle_count)
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# ARC Misc.
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deleted = Kstat["kstat.zfs.misc.arcstats.deleted"]
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mutex_miss = Kstat["kstat.zfs.misc.arcstats.mutex_miss"]
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evict_skip = Kstat["kstat.zfs.misc.arcstats.evict_skip"]
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# ARC Misc.
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output["arc_misc"] = {}
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output["arc_misc"]["deleted"] = fHits(deleted)
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output["arc_misc"]['mutex_miss'] = fHits(mutex_miss)
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output["arc_misc"]['evict_skips'] = fHits(evict_skip)
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# ARC Sizing
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arc_size = Kstat["kstat.zfs.misc.arcstats.size"]
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mru_size = Kstat["kstat.zfs.misc.arcstats.mru_size"]
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mfu_size = Kstat["kstat.zfs.misc.arcstats.mfu_size"]
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meta_limit = Kstat["kstat.zfs.misc.arcstats.arc_meta_limit"]
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meta_size = Kstat["kstat.zfs.misc.arcstats.arc_meta_used"]
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dnode_limit = Kstat["kstat.zfs.misc.arcstats.arc_dnode_limit"]
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dnode_size = Kstat["kstat.zfs.misc.arcstats.dnode_size"]
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target_max_size = Kstat["kstat.zfs.misc.arcstats.c_max"]
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target_min_size = Kstat["kstat.zfs.misc.arcstats.c_min"]
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target_size = Kstat["kstat.zfs.misc.arcstats.c"]
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target_size_ratio = (target_max_size / target_min_size)
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# ARC Sizing
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output['arc_sizing'] = {}
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output['arc_sizing']['arc_size'] = {
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'per': fPerc(arc_size, target_max_size),
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'num': fBytes(arc_size),
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}
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output['arc_sizing']['target_max_size'] = {
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'ratio': target_size_ratio,
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'num': fBytes(target_max_size),
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}
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output['arc_sizing']['target_min_size'] = {
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'per': fPerc(target_min_size, target_max_size),
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'num': fBytes(target_min_size),
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}
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output['arc_sizing']['target_size'] = {
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'per': fPerc(target_size, target_max_size),
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'num': fBytes(target_size),
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}
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output['arc_sizing']['meta_limit'] = {
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'per': fPerc(meta_limit, target_max_size),
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'num': fBytes(meta_limit),
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}
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output['arc_sizing']['meta_size'] = {
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'per': fPerc(meta_size, meta_limit),
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'num': fBytes(meta_size),
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}
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output['arc_sizing']['dnode_limit'] = {
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'per': fPerc(dnode_limit, meta_limit),
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'num': fBytes(dnode_limit),
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}
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output['arc_sizing']['dnode_size'] = {
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'per': fPerc(dnode_size, dnode_limit),
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'num': fBytes(dnode_size),
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}
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# ARC Hash Breakdown
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output['arc_hash_break'] = {}
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output['arc_hash_break']['hash_chain_max'] = Kstat[
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"kstat.zfs.misc.arcstats.hash_chain_max"
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]
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output['arc_hash_break']['hash_chains'] = Kstat[
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"kstat.zfs.misc.arcstats.hash_chains"
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]
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output['arc_hash_break']['hash_collisions'] = Kstat[
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"kstat.zfs.misc.arcstats.hash_collisions"
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]
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output['arc_hash_break']['hash_elements'] = Kstat[
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"kstat.zfs.misc.arcstats.hash_elements"
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]
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output['arc_hash_break']['hash_elements_max'] = Kstat[
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"kstat.zfs.misc.arcstats.hash_elements_max"
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]
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output['arc_size_break'] = {}
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output['arc_size_break']['recently_used_cache_size'] = {
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'per': fPerc(mru_size, mru_size + mfu_size),
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'num': fBytes(mru_size),
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}
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output['arc_size_break']['frequently_used_cache_size'] = {
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'per': fPerc(mfu_size, mru_size + mfu_size),
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'num': fBytes(mfu_size),
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}
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# ARC Hash Breakdown
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hash_chain_max = Kstat["kstat.zfs.misc.arcstats.hash_chain_max"]
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hash_chains = Kstat["kstat.zfs.misc.arcstats.hash_chains"]
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hash_collisions = Kstat["kstat.zfs.misc.arcstats.hash_collisions"]
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hash_elements = Kstat["kstat.zfs.misc.arcstats.hash_elements"]
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hash_elements_max = Kstat["kstat.zfs.misc.arcstats.hash_elements_max"]
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output['arc_hash_break'] = {}
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output['arc_hash_break']['elements_max'] = fHits(hash_elements_max)
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output['arc_hash_break']['elements_current'] = {
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'per': fPerc(hash_elements, hash_elements_max),
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'num': fHits(hash_elements),
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}
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output['arc_hash_break']['collisions'] = fHits(hash_collisions)
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output['arc_hash_break']['chain_max'] = fHits(hash_chain_max)
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output['arc_hash_break']['chains'] = fHits(hash_chains)
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return output
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def _arc_summary(Kstat):
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"""Print information on the ARC"""
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# ARC Sizing
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arc = get_arc_summary(Kstat)
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sys.stdout.write("ARC Summary: (%s)\n" % arc['health'])
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sys.stdout.write("\tMemory Throttle Count:\t\t\t%s\n" %
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arc['memory_throttle_count'])
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sys.stdout.write("\n")
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# ARC Misc.
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sys.stdout.write("ARC Misc:\n")
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sys.stdout.write("\tDeleted:\t\t\t\t%s\n" % arc['arc_misc']['deleted'])
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sys.stdout.write("\tMutex Misses:\t\t\t\t%s\n" %
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arc['arc_misc']['mutex_miss'])
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sys.stdout.write("\tEvict Skips:\t\t\t\t%s\n" %
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arc['arc_misc']['evict_skips'])
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sys.stdout.write("\n")
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# ARC Sizing
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sys.stdout.write("ARC Size:\t\t\t\t%s\t%s\n" % (
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arc['arc_sizing']['arc_size']['per'],
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arc['arc_sizing']['arc_size']['num']
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)
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)
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sys.stdout.write("\tTarget Size: (Adaptive)\t\t%s\t%s\n" % (
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arc['arc_sizing']['target_size']['per'],
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arc['arc_sizing']['target_size']['num'],
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)
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)
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sys.stdout.write("\tMin Size (Hard Limit):\t\t%s\t%s\n" % (
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arc['arc_sizing']['target_min_size']['per'],
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arc['arc_sizing']['target_min_size']['num'],
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)
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)
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sys.stdout.write("\tMax Size (High Water):\t\t%d:1\t%s\n" % (
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arc['arc_sizing']['target_max_size']['ratio'],
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arc['arc_sizing']['target_max_size']['num'],
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)
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)
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sys.stdout.write("\nARC Size Breakdown:\n")
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sys.stdout.write("\tRecently Used Cache Size:\t%s\t%s\n" % (
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arc['arc_size_break']['recently_used_cache_size']['per'],
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arc['arc_size_break']['recently_used_cache_size']['num'],
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)
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)
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sys.stdout.write("\tFrequently Used Cache Size:\t%s\t%s\n" % (
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arc['arc_size_break']['frequently_used_cache_size']['per'],
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arc['arc_size_break']['frequently_used_cache_size']['num'],
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)
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)
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sys.stdout.write("\tMetadata Size (Hard Limit):\t%s\t%s\n" % (
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arc['arc_sizing']['meta_limit']['per'],
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arc['arc_sizing']['meta_limit']['num'],
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)
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)
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sys.stdout.write("\tMetadata Size:\t\t\t%s\t%s\n" % (
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arc['arc_sizing']['meta_size']['per'],
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arc['arc_sizing']['meta_size']['num'],
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)
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)
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sys.stdout.write("\tDnode Size (Hard Limit):\t%s\t%s\n" % (
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arc['arc_sizing']['dnode_limit']['per'],
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arc['arc_sizing']['dnode_limit']['num'],
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)
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)
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sys.stdout.write("\tDnode Size:\t\t\t%s\t%s\n" % (
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arc['arc_sizing']['dnode_size']['per'],
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arc['arc_sizing']['dnode_size']['num'],
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)
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)
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sys.stdout.write("\n")
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# ARC Hash Breakdown
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sys.stdout.write("ARC Hash Breakdown:\n")
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sys.stdout.write("\tElements Max:\t\t\t\t%s\n" %
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arc['arc_hash_break']['elements_max'])
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sys.stdout.write("\tElements Current:\t\t%s\t%s\n" % (
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arc['arc_hash_break']['elements_current']['per'],
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arc['arc_hash_break']['elements_current']['num'],
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)
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)
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sys.stdout.write("\tCollisions:\t\t\t\t%s\n" %
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arc['arc_hash_break']['collisions'])
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sys.stdout.write("\tChain Max:\t\t\t\t%s\n" %
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arc['arc_hash_break']['chain_max'])
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sys.stdout.write("\tChains:\t\t\t\t\t%s\n" %
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arc['arc_hash_break']['chains'])
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def get_arc_efficiency(Kstat):
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"""Collect information on the efficiency of the ARC"""
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output = {}
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arc_hits = Kstat["kstat.zfs.misc.arcstats.hits"]
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arc_misses = Kstat["kstat.zfs.misc.arcstats.misses"]
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demand_data_hits = Kstat["kstat.zfs.misc.arcstats.demand_data_hits"]
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demand_data_misses = Kstat["kstat.zfs.misc.arcstats.demand_data_misses"]
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demand_metadata_hits = Kstat[
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"kstat.zfs.misc.arcstats.demand_metadata_hits"
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]
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demand_metadata_misses = Kstat[
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"kstat.zfs.misc.arcstats.demand_metadata_misses"
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]
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mfu_ghost_hits = Kstat["kstat.zfs.misc.arcstats.mfu_ghost_hits"]
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mfu_hits = Kstat["kstat.zfs.misc.arcstats.mfu_hits"]
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mru_ghost_hits = Kstat["kstat.zfs.misc.arcstats.mru_ghost_hits"]
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mru_hits = Kstat["kstat.zfs.misc.arcstats.mru_hits"]
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prefetch_data_hits = Kstat["kstat.zfs.misc.arcstats.prefetch_data_hits"]
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prefetch_data_misses = Kstat[
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"kstat.zfs.misc.arcstats.prefetch_data_misses"
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]
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prefetch_metadata_hits = Kstat[
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"kstat.zfs.misc.arcstats.prefetch_metadata_hits"
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]
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prefetch_metadata_misses = Kstat[
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"kstat.zfs.misc.arcstats.prefetch_metadata_misses"
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]
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anon_hits = arc_hits - (
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mfu_hits + mru_hits + mfu_ghost_hits + mru_ghost_hits
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)
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arc_accesses_total = (arc_hits + arc_misses)
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demand_data_total = (demand_data_hits + demand_data_misses)
|
|
prefetch_data_total = (prefetch_data_hits + prefetch_data_misses)
|
|
real_hits = (mfu_hits + mru_hits)
|
|
|
|
output["total_accesses"] = fHits(arc_accesses_total)
|
|
output["cache_hit_ratio"] = {
|
|
'per': fPerc(arc_hits, arc_accesses_total),
|
|
'num': fHits(arc_hits),
|
|
}
|
|
output["cache_miss_ratio"] = {
|
|
'per': fPerc(arc_misses, arc_accesses_total),
|
|
'num': fHits(arc_misses),
|
|
}
|
|
output["actual_hit_ratio"] = {
|
|
'per': fPerc(real_hits, arc_accesses_total),
|
|
'num': fHits(real_hits),
|
|
}
|
|
output["data_demand_efficiency"] = {
|
|
'per': fPerc(demand_data_hits, demand_data_total),
|
|
'num': fHits(demand_data_total),
|
|
}
|
|
|
|
if prefetch_data_total > 0:
|
|
output["data_prefetch_efficiency"] = {
|
|
'per': fPerc(prefetch_data_hits, prefetch_data_total),
|
|
'num': fHits(prefetch_data_total),
|
|
}
|
|
|
|
if anon_hits > 0:
|
|
output["cache_hits_by_cache_list"] = {}
|
|
output["cache_hits_by_cache_list"]["anonymously_used"] = {
|
|
'per': fPerc(anon_hits, arc_hits),
|
|
'num': fHits(anon_hits),
|
|
}
|
|
|
|
output["most_recently_used"] = {
|
|
'per': fPerc(mru_hits, arc_hits),
|
|
'num': fHits(mru_hits),
|
|
}
|
|
output["most_frequently_used"] = {
|
|
'per': fPerc(mfu_hits, arc_hits),
|
|
'num': fHits(mfu_hits),
|
|
}
|
|
output["most_recently_used_ghost"] = {
|
|
'per': fPerc(mru_ghost_hits, arc_hits),
|
|
'num': fHits(mru_ghost_hits),
|
|
}
|
|
output["most_frequently_used_ghost"] = {
|
|
'per': fPerc(mfu_ghost_hits, arc_hits),
|
|
'num': fHits(mfu_ghost_hits),
|
|
}
|
|
|
|
output["cache_hits_by_data_type"] = {}
|
|
output["cache_hits_by_data_type"]["demand_data"] = {
|
|
'per': fPerc(demand_data_hits, arc_hits),
|
|
'num': fHits(demand_data_hits),
|
|
}
|
|
output["cache_hits_by_data_type"]["prefetch_data"] = {
|
|
'per': fPerc(prefetch_data_hits, arc_hits),
|
|
'num': fHits(prefetch_data_hits),
|
|
}
|
|
output["cache_hits_by_data_type"]["demand_metadata"] = {
|
|
'per': fPerc(demand_metadata_hits, arc_hits),
|
|
'num': fHits(demand_metadata_hits),
|
|
}
|
|
output["cache_hits_by_data_type"]["prefetch_metadata"] = {
|
|
'per': fPerc(prefetch_metadata_hits, arc_hits),
|
|
'num': fHits(prefetch_metadata_hits),
|
|
}
|
|
|
|
output["cache_misses_by_data_type"] = {}
|
|
output["cache_misses_by_data_type"]["demand_data"] = {
|
|
'per': fPerc(demand_data_misses, arc_misses),
|
|
'num': fHits(demand_data_misses),
|
|
}
|
|
output["cache_misses_by_data_type"]["prefetch_data"] = {
|
|
'per': fPerc(prefetch_data_misses, arc_misses),
|
|
'num': fHits(prefetch_data_misses),
|
|
}
|
|
output["cache_misses_by_data_type"]["demand_metadata"] = {
|
|
'per': fPerc(demand_metadata_misses, arc_misses),
|
|
'num': fHits(demand_metadata_misses),
|
|
}
|
|
output["cache_misses_by_data_type"]["prefetch_metadata"] = {
|
|
'per': fPerc(prefetch_metadata_misses, arc_misses),
|
|
'num': fHits(prefetch_metadata_misses),
|
|
}
|
|
|
|
return output
|
|
|
|
|
|
def _arc_efficiency(Kstat):
|
|
"""Print information on the efficiency of the ARC"""
|
|
|
|
arc = get_arc_efficiency(Kstat)
|
|
|
|
sys.stdout.write("ARC Total accesses:\t\t\t\t\t%s\n" %
|
|
arc['total_accesses'])
|
|
sys.stdout.write("\tCache Hit Ratio:\t\t%s\t%s\n" % (
|
|
arc['cache_hit_ratio']['per'],
|
|
arc['cache_hit_ratio']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\tCache Miss Ratio:\t\t%s\t%s\n" % (
|
|
arc['cache_miss_ratio']['per'],
|
|
arc['cache_miss_ratio']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\tActual Hit Ratio:\t\t%s\t%s\n" % (
|
|
arc['actual_hit_ratio']['per'],
|
|
arc['actual_hit_ratio']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\n")
|
|
sys.stdout.write("\tData Demand Efficiency:\t\t%s\t%s\n" % (
|
|
arc['data_demand_efficiency']['per'],
|
|
arc['data_demand_efficiency']['num'],
|
|
)
|
|
)
|
|
|
|
if 'data_prefetch_efficiency' in arc:
|
|
sys.stdout.write("\tData Prefetch Efficiency:\t%s\t%s\n" % (
|
|
arc['data_prefetch_efficiency']['per'],
|
|
arc['data_prefetch_efficiency']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\n")
|
|
|
|
sys.stdout.write("\tCACHE HITS BY CACHE LIST:\n")
|
|
if 'cache_hits_by_cache_list' in arc:
|
|
sys.stdout.write("\t Anonymously Used:\t\t%s\t%s\n" % (
|
|
arc['cache_hits_by_cache_list']['anonymously_used']['per'],
|
|
arc['cache_hits_by_cache_list']['anonymously_used']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Most Recently Used:\t\t%s\t%s\n" % (
|
|
arc['most_recently_used']['per'],
|
|
arc['most_recently_used']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Most Frequently Used:\t\t%s\t%s\n" % (
|
|
arc['most_frequently_used']['per'],
|
|
arc['most_frequently_used']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Most Recently Used Ghost:\t%s\t%s\n" % (
|
|
arc['most_recently_used_ghost']['per'],
|
|
arc['most_recently_used_ghost']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Most Frequently Used Ghost:\t%s\t%s\n" % (
|
|
arc['most_frequently_used_ghost']['per'],
|
|
arc['most_frequently_used_ghost']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\n\tCACHE HITS BY DATA TYPE:\n")
|
|
sys.stdout.write("\t Demand Data:\t\t\t%s\t%s\n" % (
|
|
arc["cache_hits_by_data_type"]['demand_data']['per'],
|
|
arc["cache_hits_by_data_type"]['demand_data']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Prefetch Data:\t\t%s\t%s\n" % (
|
|
arc["cache_hits_by_data_type"]['prefetch_data']['per'],
|
|
arc["cache_hits_by_data_type"]['prefetch_data']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Demand Metadata:\t\t%s\t%s\n" % (
|
|
arc["cache_hits_by_data_type"]['demand_metadata']['per'],
|
|
arc["cache_hits_by_data_type"]['demand_metadata']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Prefetch Metadata:\t\t%s\t%s\n" % (
|
|
arc["cache_hits_by_data_type"]['prefetch_metadata']['per'],
|
|
arc["cache_hits_by_data_type"]['prefetch_metadata']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\n\tCACHE MISSES BY DATA TYPE:\n")
|
|
sys.stdout.write("\t Demand Data:\t\t\t%s\t%s\n" % (
|
|
arc["cache_misses_by_data_type"]['demand_data']['per'],
|
|
arc["cache_misses_by_data_type"]['demand_data']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Prefetch Data:\t\t%s\t%s\n" % (
|
|
arc["cache_misses_by_data_type"]['prefetch_data']['per'],
|
|
arc["cache_misses_by_data_type"]['prefetch_data']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Demand Metadata:\t\t%s\t%s\n" % (
|
|
arc["cache_misses_by_data_type"]['demand_metadata']['per'],
|
|
arc["cache_misses_by_data_type"]['demand_metadata']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Prefetch Metadata:\t\t%s\t%s\n" % (
|
|
arc["cache_misses_by_data_type"]['prefetch_metadata']['per'],
|
|
arc["cache_misses_by_data_type"]['prefetch_metadata']['num'],
|
|
)
|
|
)
|
|
|
|
|
|
def get_l2arc_summary(Kstat):
|
|
"""Collection information on the L2ARC"""
|
|
|
|
output = {}
|
|
|
|
l2_abort_lowmem = Kstat["kstat.zfs.misc.arcstats.l2_abort_lowmem"]
|
|
l2_cksum_bad = Kstat["kstat.zfs.misc.arcstats.l2_cksum_bad"]
|
|
l2_evict_lock_retry = Kstat["kstat.zfs.misc.arcstats.l2_evict_lock_retry"]
|
|
l2_evict_reading = Kstat["kstat.zfs.misc.arcstats.l2_evict_reading"]
|
|
l2_feeds = Kstat["kstat.zfs.misc.arcstats.l2_feeds"]
|
|
l2_free_on_write = Kstat["kstat.zfs.misc.arcstats.l2_free_on_write"]
|
|
l2_hdr_size = Kstat["kstat.zfs.misc.arcstats.l2_hdr_size"]
|
|
l2_hits = Kstat["kstat.zfs.misc.arcstats.l2_hits"]
|
|
l2_io_error = Kstat["kstat.zfs.misc.arcstats.l2_io_error"]
|
|
l2_misses = Kstat["kstat.zfs.misc.arcstats.l2_misses"]
|
|
l2_rw_clash = Kstat["kstat.zfs.misc.arcstats.l2_rw_clash"]
|
|
l2_size = Kstat["kstat.zfs.misc.arcstats.l2_size"]
|
|
l2_asize = Kstat["kstat.zfs.misc.arcstats.l2_asize"]
|
|
l2_writes_done = Kstat["kstat.zfs.misc.arcstats.l2_writes_done"]
|
|
l2_writes_error = Kstat["kstat.zfs.misc.arcstats.l2_writes_error"]
|
|
l2_writes_sent = Kstat["kstat.zfs.misc.arcstats.l2_writes_sent"]
|
|
|
|
l2_access_total = (l2_hits + l2_misses)
|
|
output['l2_health_count'] = (l2_writes_error + l2_cksum_bad + l2_io_error)
|
|
|
|
output['l2_access_total'] = l2_access_total
|
|
output['l2_size'] = l2_size
|
|
output['l2_asize'] = l2_asize
|
|
|
|
if l2_size > 0 and l2_access_total > 0:
|
|
|
|
if output['l2_health_count'] > 0:
|
|
output["health"] = "DEGRADED"
|
|
else:
|
|
output["health"] = "HEALTHY"
|
|
|
|
output["low_memory_aborts"] = fHits(l2_abort_lowmem)
|
|
output["free_on_write"] = fHits(l2_free_on_write)
|
|
output["rw_clashes"] = fHits(l2_rw_clash)
|
|
output["bad_checksums"] = fHits(l2_cksum_bad)
|
|
output["io_errors"] = fHits(l2_io_error)
|
|
|
|
output["l2_arc_size"] = {}
|
|
output["l2_arc_size"]["adative"] = fBytes(l2_size)
|
|
output["l2_arc_size"]["actual"] = {
|
|
'per': fPerc(l2_asize, l2_size),
|
|
'num': fBytes(l2_asize)
|
|
}
|
|
output["l2_arc_size"]["head_size"] = {
|
|
'per': fPerc(l2_hdr_size, l2_size),
|
|
'num': fBytes(l2_hdr_size),
|
|
}
|
|
|
|
output["l2_arc_evicts"] = {}
|
|
output["l2_arc_evicts"]['lock_retries'] = fHits(l2_evict_lock_retry)
|
|
output["l2_arc_evicts"]['reading'] = fHits(l2_evict_reading)
|
|
|
|
output['l2_arc_breakdown'] = {}
|
|
output['l2_arc_breakdown']['value'] = fHits(l2_access_total)
|
|
output['l2_arc_breakdown']['hit_ratio'] = {
|
|
'per': fPerc(l2_hits, l2_access_total),
|
|
'num': fHits(l2_hits),
|
|
}
|
|
output['l2_arc_breakdown']['miss_ratio'] = {
|
|
'per': fPerc(l2_misses, l2_access_total),
|
|
'num': fHits(l2_misses),
|
|
}
|
|
output['l2_arc_breakdown']['feeds'] = fHits(l2_feeds)
|
|
|
|
output['l2_arc_buffer'] = {}
|
|
|
|
output['l2_arc_writes'] = {}
|
|
output['l2_writes_done'] = l2_writes_done
|
|
output['l2_writes_sent'] = l2_writes_sent
|
|
if l2_writes_done != l2_writes_sent:
|
|
output['l2_arc_writes']['writes_sent'] = {
|
|
'value': "FAULTED",
|
|
'num': fHits(l2_writes_sent),
|
|
}
|
|
output['l2_arc_writes']['done_ratio'] = {
|
|
'per': fPerc(l2_writes_done, l2_writes_sent),
|
|
'num': fHits(l2_writes_done),
|
|
}
|
|
output['l2_arc_writes']['error_ratio'] = {
|
|
'per': fPerc(l2_writes_error, l2_writes_sent),
|
|
'num': fHits(l2_writes_error),
|
|
}
|
|
else:
|
|
output['l2_arc_writes']['writes_sent'] = {
|
|
'per': fPerc(100),
|
|
'num': fHits(l2_writes_sent),
|
|
}
|
|
|
|
return output
|
|
|
|
|
|
def _l2arc_summary(Kstat):
|
|
"""Print information on the L2ARC"""
|
|
|
|
arc = get_l2arc_summary(Kstat)
|
|
|
|
if arc['l2_size'] > 0 and arc['l2_access_total'] > 0:
|
|
sys.stdout.write("L2 ARC Summary: ")
|
|
if arc['l2_health_count'] > 0:
|
|
sys.stdout.write("(DEGRADED)\n")
|
|
else:
|
|
sys.stdout.write("(HEALTHY)\n")
|
|
sys.stdout.write("\tLow Memory Aborts:\t\t\t%s\n" %
|
|
arc['low_memory_aborts'])
|
|
sys.stdout.write("\tFree on Write:\t\t\t\t%s\n" % arc['free_on_write'])
|
|
sys.stdout.write("\tR/W Clashes:\t\t\t\t%s\n" % arc['rw_clashes'])
|
|
sys.stdout.write("\tBad Checksums:\t\t\t\t%s\n" % arc['bad_checksums'])
|
|
sys.stdout.write("\tIO Errors:\t\t\t\t%s\n" % arc['io_errors'])
|
|
sys.stdout.write("\n")
|
|
|
|
sys.stdout.write("L2 ARC Size: (Adaptive)\t\t\t\t%s\n" %
|
|
arc["l2_arc_size"]["adative"])
|
|
sys.stdout.write("\tCompressed:\t\t\t%s\t%s\n" % (
|
|
arc["l2_arc_size"]["actual"]["per"],
|
|
arc["l2_arc_size"]["actual"]["num"],
|
|
)
|
|
)
|
|
sys.stdout.write("\tHeader Size:\t\t\t%s\t%s\n" % (
|
|
arc["l2_arc_size"]["head_size"]["per"],
|
|
arc["l2_arc_size"]["head_size"]["num"],
|
|
)
|
|
)
|
|
sys.stdout.write("\n")
|
|
|
|
if arc["l2_arc_evicts"]['lock_retries'] != '0' or \
|
|
arc["l2_arc_evicts"]["reading"] != '0':
|
|
sys.stdout.write("L2 ARC Evicts:\n")
|
|
sys.stdout.write("\tLock Retries:\t\t\t\t%s\n" %
|
|
arc["l2_arc_evicts"]['lock_retries'])
|
|
sys.stdout.write("\tUpon Reading:\t\t\t\t%s\n" %
|
|
arc["l2_arc_evicts"]["reading"])
|
|
sys.stdout.write("\n")
|
|
|
|
sys.stdout.write("L2 ARC Breakdown:\t\t\t\t%s\n" %
|
|
arc['l2_arc_breakdown']['value'])
|
|
sys.stdout.write("\tHit Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['l2_arc_breakdown']['hit_ratio']['per'],
|
|
arc['l2_arc_breakdown']['hit_ratio']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\tMiss Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['l2_arc_breakdown']['miss_ratio']['per'],
|
|
arc['l2_arc_breakdown']['miss_ratio']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\tFeeds:\t\t\t\t\t%s\n" %
|
|
arc['l2_arc_breakdown']['feeds'])
|
|
sys.stdout.write("\n")
|
|
|
|
sys.stdout.write("L2 ARC Writes:\n")
|
|
if arc['l2_writes_done'] != arc['l2_writes_sent']:
|
|
sys.stdout.write("\tWrites Sent: (%s)\t\t\t\t%s\n" % (
|
|
arc['l2_arc_writes']['writes_sent']['value'],
|
|
arc['l2_arc_writes']['writes_sent']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Done Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['l2_arc_writes']['done_ratio']['per'],
|
|
arc['l2_arc_writes']['done_ratio']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\t Error Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['l2_arc_writes']['error_ratio']['per'],
|
|
arc['l2_arc_writes']['error_ratio']['num'],
|
|
)
|
|
)
|
|
else:
|
|
sys.stdout.write("\tWrites Sent:\t\t\t%s\t%s\n" % (
|
|
arc['l2_arc_writes']['writes_sent']['per'],
|
|
arc['l2_arc_writes']['writes_sent']['num'],
|
|
)
|
|
)
|
|
|
|
|
|
def get_dmu_summary(Kstat):
|
|
"""Collect information on the DMU"""
|
|
|
|
output = {}
|
|
|
|
zfetch_hits = Kstat["kstat.zfs.misc.zfetchstats.hits"]
|
|
zfetch_misses = Kstat["kstat.zfs.misc.zfetchstats.misses"]
|
|
|
|
zfetch_access_total = (zfetch_hits + zfetch_misses)
|
|
output['zfetch_access_total'] = zfetch_access_total
|
|
|
|
if zfetch_access_total > 0:
|
|
output['dmu'] = {}
|
|
output['dmu']['efficiency'] = {}
|
|
output['dmu']['efficiency']['value'] = fHits(zfetch_access_total)
|
|
output['dmu']['efficiency']['hit_ratio'] = {
|
|
'per': fPerc(zfetch_hits, zfetch_access_total),
|
|
'num': fHits(zfetch_hits),
|
|
}
|
|
output['dmu']['efficiency']['miss_ratio'] = {
|
|
'per': fPerc(zfetch_misses, zfetch_access_total),
|
|
'num': fHits(zfetch_misses),
|
|
}
|
|
|
|
return output
|
|
|
|
|
|
def _dmu_summary(Kstat):
|
|
"""Print information on the DMU"""
|
|
|
|
arc = get_dmu_summary(Kstat)
|
|
|
|
if arc['zfetch_access_total'] > 0:
|
|
sys.stdout.write("DMU Prefetch Efficiency:\t\t\t\t\t%s\n" %
|
|
arc['dmu']['efficiency']['value'])
|
|
sys.stdout.write("\tHit Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['dmu']['efficiency']['hit_ratio']['per'],
|
|
arc['dmu']['efficiency']['hit_ratio']['num'],
|
|
)
|
|
)
|
|
sys.stdout.write("\tMiss Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['dmu']['efficiency']['miss_ratio']['per'],
|
|
arc['dmu']['efficiency']['miss_ratio']['num'],
|
|
)
|
|
)
|
|
|
|
sys.stdout.write("\n")
|
|
|
|
|
|
def get_vdev_summary(Kstat):
|
|
"""Collect information on the VDEVs"""
|
|
|
|
output = {}
|
|
|
|
vdev_cache_delegations = \
|
|
Kstat["kstat.zfs.misc.vdev_cache_stats.delegations"]
|
|
vdev_cache_misses = Kstat["kstat.zfs.misc.vdev_cache_stats.misses"]
|
|
vdev_cache_hits = Kstat["kstat.zfs.misc.vdev_cache_stats.hits"]
|
|
vdev_cache_total = (vdev_cache_misses + vdev_cache_hits +
|
|
vdev_cache_delegations)
|
|
|
|
output['vdev_cache_total'] = vdev_cache_total
|
|
|
|
if vdev_cache_total > 0:
|
|
output['summary'] = fHits(vdev_cache_total)
|
|
output['hit_ratio'] = {
|
|
'per': fPerc(vdev_cache_hits, vdev_cache_total),
|
|
'num': fHits(vdev_cache_hits),
|
|
}
|
|
output['miss_ratio'] = {
|
|
'per': fPerc(vdev_cache_misses, vdev_cache_total),
|
|
'num': fHits(vdev_cache_misses),
|
|
}
|
|
output['delegations'] = {
|
|
'per': fPerc(vdev_cache_delegations, vdev_cache_total),
|
|
'num': fHits(vdev_cache_delegations),
|
|
}
|
|
|
|
return output
|
|
|
|
|
|
def _vdev_summary(Kstat):
|
|
"""Print information on the VDEVs"""
|
|
|
|
arc = get_vdev_summary(Kstat)
|
|
|
|
if arc['vdev_cache_total'] > 0:
|
|
sys.stdout.write("VDEV Cache Summary:\t\t\t\t%s\n" % arc['summary'])
|
|
sys.stdout.write("\tHit Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['hit_ratio']['per'],
|
|
arc['hit_ratio']['num'],
|
|
))
|
|
sys.stdout.write("\tMiss Ratio:\t\t\t%s\t%s\n" % (
|
|
arc['miss_ratio']['per'],
|
|
arc['miss_ratio']['num'],
|
|
))
|
|
sys.stdout.write("\tDelegations:\t\t\t%s\t%s\n" % (
|
|
arc['delegations']['per'],
|
|
arc['delegations']['num'],
|
|
))
|
|
|
|
|
|
def _tunable_summary(Kstat):
|
|
"""Print information on tunables, including descriptions if requested"""
|
|
|
|
global show_tunable_descriptions
|
|
global alternate_tunable_layout
|
|
|
|
tunables = load_tunables()
|
|
descriptions = {}
|
|
|
|
if show_tunable_descriptions:
|
|
|
|
command = ["/sbin/modinfo", "zfs", "-0"]
|
|
|
|
try:
|
|
p = Popen(command, stdin=PIPE, stdout=PIPE,
|
|
stderr=PIPE, shell=False, close_fds=True)
|
|
p.wait()
|
|
|
|
# By default, Python 2 returns a string as the first element of the
|
|
# tuple from p.communicate(), while Python 3 returns bytes which
|
|
# must be decoded first. The better way to do this would be with
|
|
# subprocess.run() or at least .check_output(), but this fails on
|
|
# CentOS 6 because of its old version of Python 2
|
|
desc = bytes.decode(p.communicate()[0])
|
|
description_list = desc.strip().split('\0')
|
|
|
|
if p.returncode == 0:
|
|
for tunable in description_list:
|
|
if tunable[0:5] == 'parm:':
|
|
tunable = tunable[5:].strip()
|
|
name, description = tunable.split(':', 1)
|
|
if not description:
|
|
description = "Description unavailable"
|
|
descriptions[name] = description
|
|
else:
|
|
sys.stderr.write("%s: '%s' exited with code %i\n" %
|
|
(sys.argv[0], command[0], p.returncode))
|
|
sys.stderr.write("Tunable descriptions will be disabled.\n")
|
|
except OSError as e:
|
|
sys.stderr.write("%s: Cannot run '%s': %s\n" %
|
|
(sys.argv[0], command[0], e.strerror))
|
|
sys.stderr.write("Tunable descriptions will be disabled.\n")
|
|
|
|
sys.stdout.write("ZFS Tunables:\n")
|
|
|
|
if alternate_tunable_layout:
|
|
fmt = "\t%s=%s\n"
|
|
else:
|
|
fmt = "\t%-50s%s\n"
|
|
|
|
for name in sorted(tunables.keys()):
|
|
if show_tunable_descriptions and name in descriptions:
|
|
sys.stdout.write("\t# %s\n" % descriptions[name])
|
|
|
|
sys.stdout.write(fmt % (name, tunables[name]))
|
|
|
|
|
|
unSub = [
|
|
_arc_summary,
|
|
_arc_efficiency,
|
|
_l2arc_summary,
|
|
_dmu_summary,
|
|
_vdev_summary,
|
|
_tunable_summary
|
|
]
|
|
|
|
|
|
def zfs_header():
|
|
"""Print title string with date"""
|
|
|
|
daydate = time.strftime('%a %b %d %H:%M:%S %Y')
|
|
|
|
sys.stdout.write('\n'+'-'*72+'\n')
|
|
sys.stdout.write('ZFS Subsystem Report\t\t\t\t%s' % daydate)
|
|
sys.stdout.write('\n')
|
|
|
|
|
|
def usage():
|
|
"""Print usage information"""
|
|
|
|
sys.stdout.write("Usage: arc_summary [-h] [-a] [-d] [-p PAGE]\n\n")
|
|
sys.stdout.write("\t -h, --help : "
|
|
"Print this help message and exit\n")
|
|
sys.stdout.write("\t -a, --alternate : "
|
|
"Show an alternate sysctl layout\n")
|
|
sys.stdout.write("\t -d, --description : "
|
|
"Show the sysctl descriptions\n")
|
|
sys.stdout.write("\t -p PAGE, --page=PAGE : "
|
|
"Select a single output page to display,\n")
|
|
sys.stdout.write("\t "
|
|
"should be an integer between 1 and " +
|
|
str(len(unSub)) + "\n\n")
|
|
sys.stdout.write("Examples:\n")
|
|
sys.stdout.write("\tarc_summary -a\n")
|
|
sys.stdout.write("\tarc_summary -p 4\n")
|
|
sys.stdout.write("\tarc_summary -ad\n")
|
|
sys.stdout.write("\tarc_summary --page=2\n")
|
|
|
|
|
|
def main():
|
|
"""Main function"""
|
|
|
|
global show_tunable_descriptions
|
|
global alternate_tunable_layout
|
|
|
|
try:
|
|
opts, args = getopt.getopt(
|
|
sys.argv[1:],
|
|
"adp:h", ["alternate", "description", "page=", "help"]
|
|
)
|
|
except getopt.error as e:
|
|
sys.stderr.write("Error: %s\n" % e.msg)
|
|
usage()
|
|
sys.exit(1)
|
|
|
|
args = {}
|
|
for opt, arg in opts:
|
|
if opt in ('-a', '--alternate'):
|
|
args['a'] = True
|
|
if opt in ('-d', '--description'):
|
|
args['d'] = True
|
|
if opt in ('-p', '--page'):
|
|
args['p'] = arg
|
|
if opt in ('-h', '--help'):
|
|
usage()
|
|
sys.exit(0)
|
|
|
|
Kstat = get_Kstat()
|
|
|
|
alternate_tunable_layout = 'a' in args
|
|
show_tunable_descriptions = 'd' in args
|
|
|
|
pages = []
|
|
|
|
if 'p' in args:
|
|
try:
|
|
pages.append(unSub[int(args['p']) - 1])
|
|
except IndexError:
|
|
sys.stderr.write('the argument to -p must be between 1 and ' +
|
|
str(len(unSub)) + '\n')
|
|
sys.exit(1)
|
|
else:
|
|
pages = unSub
|
|
|
|
zfs_header()
|
|
for page in pages:
|
|
page(Kstat)
|
|
sys.stdout.write("\n")
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|