2 .\" This file and its contents are supplied under the terms of the
3 .\" Common Development and Distribution License ("CDDL"), version 1.0.
4 .\" You may only use this file in accordance with the terms of version
7 .\" A full copy of the text of the CDDL should have accompanied this
8 .\" source. A copy of the CDDL is also available via the Internet at
9 .\" http://www.illumos.org/license/CDDL.
12 .\" Copyright 2014 Adam Stevko. All rights reserved.
13 .\" Copyright (c) 2015 by Delphix. All rights reserved.
15 .TH ARCSTAT 1M "Feb 4, 2014"
17 arcstat \- report ZFS ARC and L2ARC statistics
21 \fBarcstat\fR [\fB-hvxr\fR] [\fB-f field[,field]...\fR] [\fB-o file\fR] [\fB-s string\fR]
22 [\fBinterval\fR [\fBcount\fR]]
27 The \fBarcstat\fR utility print various ZFS ARC and L2ARC statistics in
33 The \fBarcstat\fR command reports the following information:
53 Demand Data hit percentage
62 Demand Data miss percentage
71 MFU List hits per second
80 Metadata hit percentage
89 Metadata miss percentage
98 MRU List hits per second
107 Prefetch hits percentage
116 Prefetch miss percentage
125 Demand Data hits per second
134 Demand Data misses per second
161 MFU Ghost List hits per second
170 Metadata hits per second
179 ARC misses per second
188 Metadata misses per second
197 MRU Ghost List hits per second
206 Prefetch hits per second
215 Prefetch misses per second
224 Total ARC accesses per second
251 Demand data accesses per second
260 evict_skip per second
278 Metadata accesses per second
287 Prefetch accesses per second
296 L2ARC access hit percentage
305 L2ARC hits per second
314 L2ARC misses per second
323 Total L2ARC accesses per second
341 mutex_miss per second
350 bytes read per second from the L2ARC
359 L2ARC access miss percentage
368 Actual (compressed) size of the L2ARC
374 The following options are supported:
382 Display only specific fields. See \fBDESCRIPTION\fR for supported statistics.
391 Display help message.
400 Report statistics to a file instead of the standard output.
409 Display data with a specified separator (default: 2 spaces).
419 Print extended stats (same as -f time,mfu,mru,mfug,mrug,eskip,mtxmis,dread,pread,read).
428 Show field headers and definitions
433 The following operands are supported:
440 Display only \fIcount\fR reports.
449 Specify the sampling interval in seconds.
454 arcstat was originally written by Neelakanth Nadgir and supported only ZFS ARC statistics.
455 Mike Harsch updated it to support L2ARC statistics.