2025-01-04 11:04:27 +11:00
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.\" SPDX-License-Identifier: CDDL-1.0
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2020-05-03 22:23:46 -04:00
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.\"
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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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2020-05-04 03:49:33 -04:00
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.\" Copyright (c) 2020 by AJ Jordan. All rights reserved.
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2020-05-03 22:23:46 -04:00
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.\"
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2025-08-28 19:26:16 -04:00
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.Dd September 19, 2024
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2025-09-09 17:52:56 +08:00
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.Dt ZARCSTAT 1
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2021-05-26 14:27:13 +02:00
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.Os
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.
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.Sh NAME
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2025-09-09 17:52:56 +08:00
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.Nm zarcstat
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2021-05-26 14:27:13 +02:00
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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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2021-06-04 22:08:50 +02:00
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.Op Fl f Ar field Ns Op , Ns Ar field Ns …
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2021-05-26 14:27:13 +02:00
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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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2021-06-04 22:08:50 +02:00
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.Bl -tag -compact -offset Ds -width "l2asize"
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2021-05-26 14:27:13 +02:00
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.It Sy c
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2020-05-04 03:49:33 -04:00
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ARC target size
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2021-05-26 14:27:13 +02:00
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.It Sy dh%
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy dm%
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2023-01-05 12:29:13 -05:00
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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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2020-05-04 03:49:33 -04:00
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Demand data miss percentage
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy mfu
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2020-05-04 03:49:33 -04:00
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MFU list hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy mh%
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2020-05-03 22:23:46 -04:00
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Metadata hit percentage
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2023-01-05 12:29:13 -05:00
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.It Sy mi%
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Metadata I/O hit percentage
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2021-05-26 14:27:13 +02:00
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.It Sy mm%
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2020-05-03 22:23:46 -04:00
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Metadata miss percentage
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2021-05-26 14:27:13 +02:00
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.It Sy mru
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2020-05-04 03:49:33 -04:00
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MRU list hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy ph%
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2020-05-03 22:23:46 -04:00
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Prefetch hits percentage
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2023-01-05 12:29:13 -05:00
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.It Sy pi%
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Prefetch I/O hits percentage
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2021-05-26 14:27:13 +02:00
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.It Sy pm%
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2020-05-03 22:23:46 -04:00
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Prefetch miss percentage
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy dhit
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy dmis
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2023-01-05 12:29:13 -05:00
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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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2020-05-04 03:49:33 -04:00
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Demand data misses per second
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy hit%
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2020-05-04 03:49:33 -04:00
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ARC hit percentage
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2021-05-26 14:27:13 +02:00
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.It Sy hits
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy mfug
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2020-05-04 03:49:33 -04:00
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MFU ghost list hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy mhit
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2020-05-03 22:23:46 -04:00
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Metadata hits per second
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2023-01-05 12:29:13 -05:00
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.It Sy mioh
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Metadata I/O hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy miss
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2020-05-03 22:23:46 -04:00
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ARC misses per second
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2021-05-26 14:27:13 +02:00
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.It Sy mmis
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2020-05-03 22:23:46 -04:00
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Metadata misses per second
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2021-05-26 14:27:13 +02:00
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.It Sy mrug
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2020-05-04 03:49:33 -04:00
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MRU ghost list hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy phit
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2020-05-03 22:23:46 -04:00
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Prefetch hits per second
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2023-01-05 12:29:13 -05:00
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.It Sy pioh
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Prefetch I/O hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy pmis
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2020-05-03 22:23:46 -04:00
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Prefetch misses per second
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy read
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2020-05-03 22:23:46 -04:00
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Total ARC accesses per second
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2021-05-26 14:27:13 +02:00
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.It Sy time
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Current time
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.It Sy size
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2020-05-04 03:49:33 -04:00
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ARC size
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2021-05-26 14:27:13 +02:00
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.It Sy arcsz
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Alias for
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.Sy size
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2023-01-05 12:29:13 -05:00
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.It Sy unc
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Uncached list hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy dread
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2023-01-05 12:29:13 -05:00
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Demand accesses per second
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.It Sy ddread
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2020-05-03 22:23:46 -04:00
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Demand data accesses per second
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2023-01-05 12:29:13 -05:00
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.It Sy dmread
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Demand metadata accesses per second
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2021-05-26 14:27:13 +02:00
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.It Sy eskip
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2020-05-03 22:23:46 -04:00
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evict_skip per second
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2021-05-26 14:27:13 +02:00
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.It Sy miss%
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2020-05-03 22:23:46 -04:00
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ARC miss percentage
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2021-05-26 14:27:13 +02:00
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.It Sy mread
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2020-05-03 22:23:46 -04:00
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Metadata accesses per second
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2021-05-26 14:27:13 +02:00
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.It Sy pread
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2020-05-03 22:23:46 -04:00
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Prefetch accesses per second
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2023-01-05 12:29:13 -05:00
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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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2021-05-26 14:27:13 +02:00
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.It Sy l2hit%
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2020-05-03 22:23:46 -04:00
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L2ARC access hit percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2hits
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2020-05-03 22:23:46 -04:00
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L2ARC hits per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2miss
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2020-05-03 22:23:46 -04:00
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L2ARC misses per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2read
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2020-05-03 22:23:46 -04:00
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Total L2ARC accesses per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2pref
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2020-09-14 13:10:44 -04:00
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L2ARC prefetch allocated size per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2pref%
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2020-09-14 13:10:44 -04:00
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L2ARC prefetch allocated size percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2mfu
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2020-09-14 13:10:44 -04:00
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L2ARC MFU allocated size per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2mfu%
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2020-09-14 13:10:44 -04:00
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L2ARC MFU allocated size percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2mru
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2020-09-14 13:10:44 -04:00
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L2ARC MRU allocated size per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2mru%
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2020-09-14 13:10:44 -04:00
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L2ARC MRU allocated size percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2data
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2020-09-14 13:10:44 -04:00
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L2ARC data (buf content) allocated size per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2data%
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2020-09-14 13:10:44 -04:00
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L2ARC data (buf content) allocated size percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2meta
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2020-09-14 13:10:44 -04:00
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L2ARC metadata (buf content) allocated size per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2meta%
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2020-09-14 13:10:44 -04:00
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L2ARC metadata (buf content) allocated size percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2size
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2020-05-03 22:23:46 -04:00
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Size of the L2ARC
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2021-05-26 14:27:13 +02:00
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.It Sy mtxmis
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2020-05-03 22:23:46 -04:00
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mutex_miss per second
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2021-05-26 14:27:13 +02:00
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.It Sy l2bytes
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2020-05-04 03:49:33 -04:00
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Bytes read per second from the L2ARC
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2024-09-19 01:44:18 +07:00
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.It Sy l2wbytes
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Bytes written per second to the L2ARC
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2021-05-26 14:27:13 +02:00
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.It Sy l2miss%
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2020-05-03 22:23:46 -04:00
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L2ARC access miss percentage
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2021-05-26 14:27:13 +02:00
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.It Sy l2asize
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2020-05-03 22:23:46 -04:00
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Actual (compressed) size of the L2ARC
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2024-09-19 01:44:18 +07:00
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.It Sy cmpsz
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Compressed size
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.It Sy cmpsz%
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Compressed size percentage
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.It Sy ovhsz
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Overhead size
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.It Sy ovhsz%
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Overhead size percentage
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.It Sy bonsz
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Bonus size
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.It Sy bonsz%
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Bonus size percentage
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.It Sy dnosz
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Dnode size
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.It Sy dnosz%
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Dnode size percentage
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.It Sy dbusz
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Dbuf size
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.It Sy dbusz%
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Dbuf size percentage
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.It Sy hdrsz
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Header size
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.It Sy hdrsz%
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Header size percentage
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.It Sy l2hsz
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L2 header size
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.It Sy l2hsz%
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L2 header size percentage
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.It Sy abdsz
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ABD chunk waste size
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.It Sy abdsz%
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ABD chunk waste size percentage
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.It Sy datatg
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ARC data target
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.It Sy datatg%
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ARC data target percentage
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.It Sy datasz
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ARC data size
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.It Sy datasz%
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ARC data size percentage
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.It Sy metatg
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ARC metadata target
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.It Sy metatg%
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ARC metadata target percentage
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.It Sy metasz
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ARC metadata size
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.It Sy metasz%
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ARC metadata size percentage
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.It Sy anosz
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Anonymous size
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.It Sy anosz%
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Anonymous size percentage
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.It Sy anoda
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Anonymous data size
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.It Sy anoda%
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Anonymous data size percentage
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.It Sy anome
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Anonymous metadata size
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.It Sy anome%
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Anonymous metadata size percentage
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.It Sy anoed
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Anonymous evictable data size
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.It Sy anoed%
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Anonymous evictable data size percentage
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.It Sy anoem
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Anonymous evictable metadata size
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.It Sy anoem%
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Anonymous evictable metadata size percentage
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.It Sy mfutg
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MFU target
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.It Sy mfutg%
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MFU target percentage
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.It Sy mfudt
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MFU data target
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.It Sy mfudt%
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MFU data target percentage
|
|
|
|
|
.It Sy mfumt
|
|
|
|
|
MFU metadata target
|
|
|
|
|
.It Sy mfumt%
|
|
|
|
|
MFU metadata target percentage
|
|
|
|
|
.It Sy mfusz
|
|
|
|
|
MFU size
|
|
|
|
|
.It Sy mfusz%
|
|
|
|
|
MFU size percentage
|
|
|
|
|
.It Sy mfuda
|
|
|
|
|
MFU data size
|
|
|
|
|
.It Sy mfuda%
|
|
|
|
|
MFU data size percentage
|
|
|
|
|
.It Sy mfume
|
|
|
|
|
MFU metadata size
|
|
|
|
|
.It Sy mfume%
|
|
|
|
|
MFU metadata size percentage
|
|
|
|
|
.It Sy mfued
|
|
|
|
|
MFU evictable data size
|
|
|
|
|
.It Sy mfued%
|
|
|
|
|
MFU evictable data size percentage
|
|
|
|
|
.It Sy mfuem
|
|
|
|
|
MFU evictable metadata size
|
|
|
|
|
.It Sy mfuem%
|
|
|
|
|
MFU evictable metadata size percentage
|
|
|
|
|
.It Sy mfugsz
|
|
|
|
|
MFU ghost size
|
|
|
|
|
.It Sy mfugd
|
|
|
|
|
MFU ghost data size
|
|
|
|
|
.It Sy mfugm
|
|
|
|
|
MFU ghost metadata size
|
|
|
|
|
.It Sy mrutg
|
|
|
|
|
MRU target
|
|
|
|
|
.It Sy mrutg%
|
|
|
|
|
MRU target percentage
|
|
|
|
|
.It Sy mrudt
|
|
|
|
|
MRU data target
|
|
|
|
|
.It Sy mrudt%
|
|
|
|
|
MRU data target percentage
|
|
|
|
|
.It Sy mrumt
|
|
|
|
|
MRU metadata target
|
|
|
|
|
.It Sy mrumt%
|
|
|
|
|
MRU metadata target percentage
|
|
|
|
|
.It Sy mrusz
|
|
|
|
|
MRU size
|
|
|
|
|
.It Sy mrusz%
|
|
|
|
|
MRU size percentage
|
|
|
|
|
.It Sy mruda
|
|
|
|
|
MRU data size
|
|
|
|
|
.It Sy mruda%
|
|
|
|
|
MRU data size percentage
|
|
|
|
|
.It Sy mrume
|
|
|
|
|
MRU metadata size
|
|
|
|
|
.It Sy mrume%
|
|
|
|
|
MRU metadata size percentage
|
|
|
|
|
.It Sy mrued
|
|
|
|
|
MRU evictable data size
|
|
|
|
|
.It Sy mrued%
|
|
|
|
|
MRU evictable data size percentage
|
|
|
|
|
.It Sy mruem
|
|
|
|
|
MRU evictable metadata size
|
|
|
|
|
.It Sy mruem%
|
|
|
|
|
MRU evictable metadata size percentage
|
|
|
|
|
.It Sy mrugsz
|
|
|
|
|
MRU ghost size
|
|
|
|
|
.It Sy mrugd
|
|
|
|
|
MRU ghost data size
|
|
|
|
|
.It Sy mrugm
|
|
|
|
|
MRU ghost metadata size
|
|
|
|
|
.It Sy uncsz
|
|
|
|
|
Uncached size
|
|
|
|
|
.It Sy uncsz%
|
|
|
|
|
Uncached size percentage
|
|
|
|
|
.It Sy uncda
|
|
|
|
|
Uncached data size
|
|
|
|
|
.It Sy uncda%
|
|
|
|
|
Uncached data size percentage
|
|
|
|
|
.It Sy uncme
|
|
|
|
|
Uncached metadata size
|
|
|
|
|
.It Sy uncme%
|
|
|
|
|
Uncached metadata size percentage
|
|
|
|
|
.It Sy unced
|
|
|
|
|
Uncached evictable data size
|
|
|
|
|
.It Sy unced%
|
|
|
|
|
Uncached evictable data size percentage
|
|
|
|
|
.It Sy uncem
|
|
|
|
|
Uncached evictable metadata size
|
|
|
|
|
.It Sy uncem%
|
|
|
|
|
Uncached evictable metadata size percentage
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Sy grow
|
2020-05-04 03:49:33 -04:00
|
|
|
ARC grow disabled
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Sy need
|
2020-05-04 03:49:33 -04:00
|
|
|
ARC reclaim needed
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Sy free
|
2022-11-12 22:23:30 +10:00
|
|
|
The ARC's idea of how much free memory there is, which includes evictable memory
|
|
|
|
|
in the page cache.
|
2021-05-26 14:27:13 +02:00
|
|
|
Since the ARC tries to keep
|
|
|
|
|
.Sy avail
|
|
|
|
|
above zero,
|
|
|
|
|
.Sy avail
|
|
|
|
|
is usually more instructive to observe than
|
|
|
|
|
.Sy free .
|
|
|
|
|
.It Sy avail
|
2022-11-12 22:23:30 +10:00
|
|
|
The ARC's idea of how much free memory is available to it, which is a bit less
|
|
|
|
|
than
|
2021-05-26 14:27:13 +02:00
|
|
|
.Sy free .
|
|
|
|
|
May temporarily be negative, in which case the ARC will reduce the target size
|
|
|
|
|
.Sy c .
|
|
|
|
|
.El
|
|
|
|
|
.
|
|
|
|
|
.Sh OPTIONS
|
|
|
|
|
.Bl -tag -width "-v"
|
|
|
|
|
.It Fl a
|
2020-10-21 17:09:14 -04:00
|
|
|
Print all possible stats.
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Fl f
|
|
|
|
|
Display only specific fields.
|
|
|
|
|
See
|
2021-06-04 22:08:50 +02:00
|
|
|
.Sx DESCRIPTION
|
2021-05-26 14:27:13 +02:00
|
|
|
for supported statistics.
|
|
|
|
|
.It Fl h
|
2020-05-03 22:23:46 -04:00
|
|
|
Display help message.
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Fl o
|
2020-05-03 22:23:46 -04:00
|
|
|
Report statistics to a file instead of the standard output.
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Fl p
|
2020-10-21 17:09:14 -04:00
|
|
|
Disable auto-scaling of numerical fields (for raw, machine-parsable values).
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Fl s
|
2020-05-03 22:23:46 -04:00
|
|
|
Display data with a specified separator (default: 2 spaces).
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Fl x
|
2021-06-04 22:08:50 +02:00
|
|
|
Print extended stats
|
|
|
|
|
.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 .
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Fl v
|
2020-05-03 22:23:46 -04:00
|
|
|
Show field headers and definitions
|
2021-05-26 14:27:13 +02:00
|
|
|
.El
|
|
|
|
|
.
|
|
|
|
|
.Sh OPERANDS
|
2020-05-03 22:23:46 -04:00
|
|
|
The following operands are supported:
|
2021-06-04 22:08:50 +02:00
|
|
|
.Bl -tag -compact -offset Ds -width "interval"
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Ar interval
|
2020-05-03 22:23:46 -04:00
|
|
|
Specify the sampling interval in seconds.
|
2021-05-26 14:27:13 +02:00
|
|
|
.It Ar count
|
2021-06-04 22:08:50 +02:00
|
|
|
Display only
|
|
|
|
|
.Ar count
|
|
|
|
|
reports.
|
2021-05-26 14:27:13 +02:00
|
|
|
.El
|
