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792a6ee462
Recent ARC commits added new statistic counters, such as iohits, uncached state, etc. Represent those. Also some of previously reported numbers were confusing or even made no sense. Cleanup and restructure existing reports. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Issue #14115 Issue #14123 Issue #14243 Closes #14320
261 lines
5.8 KiB
Groff
261 lines
5.8 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 December 23, 2022
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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 -compact -offset Ds -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 hit percentage
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.It Sy di%
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Demand I/O hit percentage
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.It Sy dm%
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Demand miss percentage
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.It Sy ddh%
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Demand data hit percentage
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.It Sy ddi%
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Demand data I/O hit percentage
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.It Sy ddm%
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Demand data miss percentage
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.It Sy dmh%
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Demand metadata hit percentage
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.It Sy dmi%
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Demand metadata I/O hit percentage
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.It Sy dmm%
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Demand metadata 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 mi%
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Metadata I/O 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 pi%
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Prefetch I/O hits percentage
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.It Sy pm%
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Prefetch miss percentage
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.It Sy pdh%
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Prefetch data hits percentage
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.It Sy pdi%
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Prefetch data I/O hits percentage
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.It Sy pdm%
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Prefetch data miss percentage
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.It Sy pmh%
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Prefetch metadata hits percentage
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.It Sy pmi%
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Prefetch metadata I/O hits percentage
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.It Sy pmm%
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Prefetch metadata miss percentage
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.It Sy dhit
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Demand hits per second
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.It Sy dioh
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Demand I/O hits per second
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.It Sy dmis
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Demand misses per second
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.It Sy ddhit
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Demand data hits per second
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.It Sy ddioh
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Demand data I/O hits per second
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.It Sy ddmis
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Demand data misses per second
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.It Sy dmhit
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Demand metadata hits per second
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.It Sy dmioh
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Demand metadata I/O hits per second
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.It Sy dmmis
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Demand metadata 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 hits per second
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.It Sy ioh%
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ARC I/O hits percentage
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.It Sy iohs
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ARC I/O hits 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 mioh
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Metadata I/O 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 pioh
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Prefetch I/O hits per second
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.It Sy pmis
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Prefetch misses per second
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.It Sy pdhit
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Prefetch data hits per second
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.It Sy pdioh
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Prefetch data I/O hits per second
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.It Sy pdmis
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Prefetch data misses per second
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.It Sy pmhit
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Prefetch metadata hits per second
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.It Sy pmioh
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Prefetch metadata I/O hits per second
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.It Sy pmmis
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Prefetch metadata 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 unc
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Uncached list hits per second
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.It Sy dread
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Demand accesses per second
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.It Sy ddread
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Demand data accesses per second
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.It Sy dmread
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Demand metadata 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 pdread
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Prefetch data accesses per second
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.It Sy pmread
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Prefetch metadata 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
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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
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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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.Sx 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
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.Pq same as Fl f Sy time , Ns Sy mfu , Ns Sy mru , Ns Sy mfug , Ns Sy mrug , Ns Sy eskip , Ns Sy mtxmis , Ns Sy dread , Ns Sy pread , Ns Sy read .
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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 -compact -offset Ds -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
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.Ar count
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reports.
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.El
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