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639871363a
Also slim down the description a tad Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12125
183 lines
4.1 KiB
Groff
183 lines
4.1 KiB
Groff
.\"
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.\" This file and its contents are supplied under the terms of the
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.\" Common Development and Distribution License ("CDDL"), version 1.0.
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.\" You may only use this file in accordance with the terms of version
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.\" 1.0 of the CDDL.
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.\"
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.\" A full copy of the text of the CDDL should have accompanied this
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.\" source. A copy of the CDDL is also available via the Internet at
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.\" http://www.illumos.org/license/CDDL.
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.\"
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.\" Copyright 2014 Adam Stevko. All rights reserved.
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.\" Copyright (c) 2015 by Delphix. All rights reserved.
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.\" Copyright (c) 2020 by AJ Jordan. All rights reserved.
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.\"
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.Dd May 26, 2021
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.Dt ARCSTAT 1
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.Os
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.
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.Sh NAME
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.Nm arcstat
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.Nd report ZFS ARC and L2ARC statistics
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.Sh SYNOPSIS
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.Nm
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.Op Fl havxp
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.Op Fl f Ar field Ns Op , Ns Ar field Ns ...
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.Op Fl o Ar file
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.Op Fl s Ar string
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.Op Ar interval
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.Op Ar count
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.
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.Sh DESCRIPTION
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.Nm
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prints various ZFS ARC and L2ARC statistics in vmstat-like fashion:
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.Bl -tag -width "l2asize"
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.It Sy c
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ARC target size
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.It Sy dh%
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Demand data hit percentage
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.It Sy dm%
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Demand data miss percentage
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.It Sy mfu
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MFU list hits per second
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.It Sy mh%
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Metadata hit percentage
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.It Sy mm%
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Metadata miss percentage
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.It Sy mru
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MRU list hits per second
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.It Sy ph%
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Prefetch hits percentage
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.It Sy pm%
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Prefetch miss percentage
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.It Sy dhit
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Demand data hits per second
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.It Sy dmis
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Demand data misses per second
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.It Sy hit%
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ARC hit percentage
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.It Sy hits
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ARC reads per second
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.It Sy mfug
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MFU ghost list hits per second
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.It Sy mhit
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Metadata hits per second
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.It Sy miss
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ARC misses per second
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.It Sy mmis
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Metadata misses per second
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.It Sy mrug
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MRU ghost list hits per second
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.It Sy phit
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Prefetch hits per second
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.It Sy pmis
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Prefetch misses per second
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.It Sy read
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Total ARC accesses per second
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.It Sy time
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Current time
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.It Sy size
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ARC size
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.It Sy arcsz
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Alias for
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.Sy size
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.It Sy dread
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Demand data accesses per second
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.It Sy eskip
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evict_skip per second
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.It Sy miss%
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ARC miss percentage
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.It Sy mread
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Metadata accesses per second
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.It Sy pread
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Prefetch accesses per second
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.It Sy l2hit%
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L2ARC access hit percentage
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.It Sy l2hits
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L2ARC hits per second
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.It Sy l2miss
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L2ARC misses per second
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.It Sy l2read
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Total L2ARC accesses per second
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.It Sy l2pref
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L2ARC prefetch allocated size per second
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.It Sy l2pref%
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L2ARC prefetch allocated size percentage
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.It Sy l2mfu
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L2ARC MFU allocated size per second
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.It Sy l2mfu%
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L2ARC MFU allocated size percentage
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.It Sy l2mru
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L2ARC MRU allocated size per second
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.It Sy l2mru%
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L2ARC MRU allocated size percentage
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.It Sy l2data
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L2ARC data (buf content) allocated size per second
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.It Sy l2data%
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L2ARC data (buf content) allocated size percentage
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.It Sy l2meta
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L2ARC metadata (buf content) allocated size per second
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.It Sy l2meta%
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L2ARC metadata (buf content) allocated size percentage
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.It Sy l2size
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Size of the L2ARC
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.It Sy mtxmis
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mutex_miss per second
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.It Sy l2bytes
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Bytes read per second from the L2ARC
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.It Sy l2miss%
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L2ARC access miss percentage
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.It Sy l2asize
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Actual (compressed) size of the L2ARC
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.It Sy grow
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ARC grow disabled
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.It Sy need
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ARC reclaim needed
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.It Sy free
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The ARC's idea of how much free memory there is, which includes evictable memory in the page cache.
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Since the ARC tries to keep
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.Sy avail
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above zero,
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.Sy avail
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is usually more instructive to observe than
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.Sy free .
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.It Sy avail
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The ARC's idea of how much free memory is available to it, which is a bit less than
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.Sy free .
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May temporarily be negative, in which case the ARC will reduce the target size
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.Sy c .
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.El
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.
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.Sh OPTIONS
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.Bl -tag -width "-v"
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.It Fl a
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Print all possible stats.
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.It Fl f
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Display only specific fields.
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See
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.Sy DESCRIPTION
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for supported statistics.
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.It Fl h
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Display help message.
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.It Fl o
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Report statistics to a file instead of the standard output.
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.It Fl p
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Disable auto-scaling of numerical fields (for raw, machine-parsable values).
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.It Fl s
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Display data with a specified separator (default: 2 spaces).
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.It Fl x
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Print extended stats (same as
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.Fl f Ar time,mfu,mru,mfug,mrug,eskip,mtxmis,dread,pread,read Ns No ).
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.It Fl v
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Show field headers and definitions
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.El
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.
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.Sh OPERANDS
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The following operands are supported:
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.Bl -tag -width "interval"
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.It Ar interval
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Specify the sampling interval in seconds.
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.It Ar count
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Display only \fIcount\fR reports.
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.El
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