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/usr/bin/env python3 is the suggested[1] shebang for Python in general (likewise for python2) and is conventional across platforms. This eases development on systems where python is not installed in /usr/bin (FreeBSD for example) and makes it possible to develop in virtual environments (venv) for isolating dependencies. Many packaging guidelines discourage the use of /usr/bin/env, but since this is the canonical way of writing shebangs in the Python community, many packaging scripts are already equipped to handle substituting the appropriate absolute path to python automatically. Some RPM package builders lacking brp-mangle-shebangs need a small fallback mechanism in the package spec to stamp the appropriate shebang on installed Python scripts. [1]: https://docs.python.org/3/using/unix.html?#miscellaneous Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Ryan Moeller <ryan@ixsystems.com> Closes #9314
1078 lines
36 KiB
Python
Executable File
1078 lines
36 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/zfsonlinux/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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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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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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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)
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prefetch_data_total = (prefetch_data_hits + prefetch_data_misses)
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real_hits = (mfu_hits + mru_hits)
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output["total_accesses"] = fHits(arc_accesses_total)
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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
|
|
|
|
def load_tunables():
|
|
basepath = '/sys/module/zfs/parameters'
|
|
tunables = {}
|
|
for name in os.listdir(basepath):
|
|
if not name:
|
|
continue
|
|
path = '%s/%s' % (basepath, name)
|
|
with open(path) as f:
|
|
value = f.read()
|
|
tunables[name] = value.strip()
|
|
return tunables
|
|
|
|
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()
|