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mirror_zfs/man/man1/arcstat.1

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Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.\"
.\" This file and its contents are supplied under the terms of the
.\" Common Development and Distribution License ("CDDL"), version 1.0.
.\" You may only use this file in accordance with the terms of version
.\" 1.0 of the CDDL.
.\"
.\" A full copy of the text of the CDDL should have accompanied this
.\" source. A copy of the CDDL is also available via the Internet at
.\" http://www.illumos.org/license/CDDL.
.\"
.\"
.\" Copyright 2014 Adam Stevko. All rights reserved.
.\" Copyright (c) 2015 by Delphix. All rights reserved.
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
.\" Copyright (c) 2020 by AJ Jordan. All rights reserved.
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.\"
arcstat: Add -a and -p options from FreeNAS Added -a option to automatically print all valid statistics. Added -p option to suppress scaling of printed data. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Authored by: Nick Principe <32284693+powernap@users.noreply.github.com> Ported-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #11090
2020-10-22 00:09:14 +03:00
.TH ARCSTAT 1 "Oct 20, 2020" OpenZFS
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.SH NAME
arcstat \- report ZFS ARC and L2ARC statistics
.SH SYNOPSIS
.LP
.nf
arcstat: Add -a and -p options from FreeNAS Added -a option to automatically print all valid statistics. Added -p option to suppress scaling of printed data. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Authored by: Nick Principe <32284693+powernap@users.noreply.github.com> Ported-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #11090
2020-10-22 00:09:14 +03:00
\fBarcstat\fR [\fB-havxp\fR] [\fB-f field[,field]...\fR] [\fB-o file\fR] [\fB-s string\fR] [\fBinterval\fR [\fBcount\fR]]
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.fi
.SH DESCRIPTION
.LP
The \fBarcstat\fR utility print various ZFS ARC and L2ARC statistics in
vmstat-like fashion.
.sp
.sp
.LP
The \fBarcstat\fR command reports the following information:
.sp
.ne 2
.\"
.sp
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
.ne 1
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.na
\fBc \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
ARC target size
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBdh% \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
Demand data hit percentage
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBdm% \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
Demand data miss percentage
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBmfu \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
MFU list hits per second
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBmh% \fR
.ad
.RS 14n
Metadata hit percentage
.RE
.sp
.ne 2
.na
\fBmm% \fR
.ad
.RS 14n
Metadata miss percentage
.RE
.sp
.ne 2
.na
\fBmru \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
MRU list hits per second
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBph% \fR
.ad
.RS 14n
Prefetch hits percentage
.RE
.sp
.ne 2
.na
\fBpm% \fR
.ad
.RS 14n
Prefetch miss percentage
.RE
.sp
.ne 2
.na
\fBdhit \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
Demand data hits per second
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBdmis \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
Demand data misses per second
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBhit% \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
ARC hit percentage
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBhits \fR
.ad
.RS 14n
ARC reads per second
.RE
.sp
.ne 2
.na
\fBmfug \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
MFU ghost list hits per second
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBmhit \fR
.ad
.RS 14n
Metadata hits per second
.RE
.sp
.ne 2
.na
\fBmiss \fR
.ad
.RS 14n
ARC misses per second
.RE
.sp
.ne 2
.na
\fBmmis \fR
.ad
.RS 14n
Metadata misses per second
.RE
.sp
.ne 2
.na
\fBmrug \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
MRU ghost list hits per second
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBphit \fR
.ad
.RS 14n
Prefetch hits per second
.RE
.sp
.ne 2
.na
\fBpmis \fR
.ad
.RS 14n
Prefetch misses per second
.RE
.sp
.ne 2
.na
\fBread \fR
.ad
.RS 14n
Total ARC accesses per second
.RE
.sp
.ne 2
.na
\fBtime \fR
.ad
.RS 14n
Time
.RE
.sp
.ne 2
.na
arcstat: add 'avail', fix 'free' The meaning of the `free` field is currently `zfs_arc_sys_free`, which is the target amount of memory to leave free for the system, and is constant after booting. This commit changes the meaning of `free` to arc_free_memory(), the amount of memory that the ARC considers to be free. It also adds a new arcstat field `avail`, which tracks `arc_available_memory()`. Since `avail` can be negative, it also updates the arcstat script to pretty-print negative values. example output: $ arcstat -f time,miss,arcsz,c,grow,need,free,avail 1 time miss arcsz c grow need free avail 15:03:02 39K 114G 114G 0 0 2.4G 407M 15:03:03 42K 114G 114G 0 0 2.1G 120M 15:03:04 40K 114G 114G 0 0 1.8G -177M 15:03:05 24K 113G 112G 0 0 1.7G -269M 15:03:06 29K 111G 110G 0 0 1.6G -385M 15:03:07 27K 110G 108G 0 0 1.4G -535M 15:03:08 13K 108G 108G 0 0 2.2G 239M 15:03:09 33K 107G 107G 0 0 1.3G -639M 15:03:10 16K 105G 102G 0 0 2.6G 704M 15:03:11 7.2K 102G 102G 0 0 5.1G 3.1G 15:03:12 42K 103G 102G 0 0 4.8G 2.8G Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #10494
2020-06-27 04:05:28 +03:00
\fBsize \fR
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
ARC size
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
arcstat: add 'avail', fix 'free' The meaning of the `free` field is currently `zfs_arc_sys_free`, which is the target amount of memory to leave free for the system, and is constant after booting. This commit changes the meaning of `free` to arc_free_memory(), the amount of memory that the ARC considers to be free. It also adds a new arcstat field `avail`, which tracks `arc_available_memory()`. Since `avail` can be negative, it also updates the arcstat script to pretty-print negative values. example output: $ arcstat -f time,miss,arcsz,c,grow,need,free,avail 1 time miss arcsz c grow need free avail 15:03:02 39K 114G 114G 0 0 2.4G 407M 15:03:03 42K 114G 114G 0 0 2.1G 120M 15:03:04 40K 114G 114G 0 0 1.8G -177M 15:03:05 24K 113G 112G 0 0 1.7G -269M 15:03:06 29K 111G 110G 0 0 1.6G -385M 15:03:07 27K 110G 108G 0 0 1.4G -535M 15:03:08 13K 108G 108G 0 0 2.2G 239M 15:03:09 33K 107G 107G 0 0 1.3G -639M 15:03:10 16K 105G 102G 0 0 2.6G 704M 15:03:11 7.2K 102G 102G 0 0 5.1G 3.1G 15:03:12 42K 103G 102G 0 0 4.8G 2.8G Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #10494
2020-06-27 04:05:28 +03:00
.sp
.ne 2
.na
\fBarcsz \fR
.ad
.RS 14n
Alias for \fBsize\fR
.RE
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.sp
.ne 2
.na
\fBdread \fR
.ad
.RS 14n
Demand data accesses per second
.RE
.sp
.ne 2
.na
\fBeskip \fR
.ad
.RS 14n
evict_skip per second
.RE
.sp
.ne 2
.na
\fBmiss% \fR
.ad
.RS 14n
ARC miss percentage
.RE
.sp
.ne 2
.na
\fBmread \fR
.ad
.RS 14n
Metadata accesses per second
.RE
.sp
.ne 2
.na
\fBpread \fR
.ad
.RS 14n
Prefetch accesses per second
.RE
.sp
.ne 2
.na
\fBl2hit% \fR
.ad
.RS 14n
L2ARC access hit percentage
.RE
.sp
.ne 2
.na
\fBl2hits \fR
.ad
.RS 14n
L2ARC hits per second
.RE
.sp
.ne 2
.na
\fBl2miss \fR
.ad
.RS 14n
L2ARC misses per second
.RE
.sp
.ne 2
.na
\fBl2read \fR
.ad
.RS 14n
Total L2ARC accesses per second
.RE
Add L2ARC arcstats for MFU/MRU buffers and buffer content type Currently the ARC state (MFU/MRU) of cached L2ARC buffer and their content type is unknown. Knowing this information may prove beneficial in adjusting the L2ARC caching policy. This commit adds L2ARC arcstats that display the aligned size (in bytes) of L2ARC buffers according to their content type (data/metadata) and according to their ARC state (MRU/MFU or prefetch). It also expands the existing evict_l2_eligible arcstat to differentiate between MFU and MRU buffers. L2ARC caches buffers from the MRU and MFU lists of ARC. Upon caching a buffer, its ARC state (MRU/MFU) is stored in the L2 header (b_arcs_state). The l2_m{f,r}u_asize arcstats reflect the aligned size (in bytes) of L2ARC buffers according to their ARC state (based on b_arcs_state). We also account for the case where an L2ARC and ARC cached MRU or MRU_ghost buffer transitions to MFU. The l2_prefetch_asize reflects the alinged size (in bytes) of L2ARC buffers that were cached while they had the prefetch flag set in ARC. This is dynamically updated as the prefetch flag of L2ARC buffers changes. When buffers are evicted from ARC, if they are determined to be L2ARC eligible then their logical size is recorded in evict_l2_eligible_m{r,f}u arcstats according to their ARC state upon eviction. Persistent L2ARC: When committing an L2ARC buffer to a log block (L2ARC metadata) its b_arcs_state and prefetch flag is also stored. If the buffer changes its arcstate or prefetch flag this is reflected in the above arcstats. However, the L2ARC metadata cannot currently be updated to reflect this change. Example: L2ARC caches an MRU buffer. L2ARC metadata and arcstats count this as an MRU buffer. The buffer transitions to MFU. The arcstats are updated to reflect this. Upon pool re-import or on/offlining the L2ARC device the arcstats are cleared and the buffer will now be counted as an MRU buffer, as the L2ARC metadata were not updated. Bug fix: - If l2arc_noprefetch is set, arc_read_done clears the L2CACHE flag of an ARC buffer. However, prefetches may be issued in a way that arc_read_done() is bypassed. Instead, move the related code in l2arc_write_eligible() to account for those cases too. Also add a test and update manpages for l2arc_mfuonly module parameter, and update the manpages and code comments for l2arc_noprefetch. Move persist_l2arc tests to l2arc. Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org> Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: George Amanakis <gamanakis@gmail.com> Closes #10743
2020-09-14 20:10:44 +03:00
.sp
.ne 2
.na
\fBl2pref \fR
.ad
.RS 14n
L2ARC prefetch allocated size per second
.RE
.sp
.ne 2
.na
\fBl2pref% \fR
.ad
.RS 14n
L2ARC prefetch allocated size percentage
.RE
.sp
.ne 2
.na
\fBl2mfu \fR
.ad
.RS 14n
L2ARC MFU allocated size per second
.RE
.sp
.ne 2
.na
\fBl2mfu% \fR
.ad
.RS 14n
L2ARC MFU allocated size percentage
.RE
.sp
.ne 2
.na
\fBl2mru \fR
.ad
.RS 14n
L2ARC MRU allocated size per second
.RE
.sp
.ne 2
.na
\fBl2mru% \fR
.ad
.RS 14n
L2ARC MRU allocated size percentage
.RE
.sp
.ne 2
.na
\fBl2data \fR
.ad
.RS 14n
L2ARC data (buf content) allocated size per second
.RE
.sp
.ne 2
.na
\fBl2data% \fR
.ad
.RS 14n
L2ARC data (buf content) allocated size percentage
.RE
.sp
.ne 2
.na
\fBl2meta \fR
.ad
.RS 14n
L2ARC metadata (buf content) allocated size per second
.RE
.sp
.ne 2
.na
\fBl2meta% \fR
.ad
.RS 14n
L2ARC metadata (buf content) allocated size percentage
.RE
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.sp
.ne 2
.na
\fBl2size \fR
.ad
.RS 14n
Size of the L2ARC
.RE
.sp
.ne 2
.na
\fBmtxmis \fR
.ad
.RS 14n
mutex_miss per second
.RE
.sp
.ne 2
.na
\fBl2bytes \fR
.ad
.RS 14n
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
Bytes read per second from the L2ARC
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.RE
.sp
.ne 2
.na
\fBl2miss% \fR
.ad
.RS 14n
L2ARC access miss percentage
.RE
.sp
.ne 2
.na
\fBl2asize \fR
.ad
.RS 14n
Actual (compressed) size of the L2ARC
.RE
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
.sp
.ne 2
.na
\fBgrow \fR
.ad
.RS 14n
ARC grow disabled
.RE
.sp
.ne 2
.na
\fBneed \fR
.ad
.RS 14n
ARC reclaim needed
.RE
.sp
.ne 2
.na
\fBfree \fR
.ad
.RS 14n
arcstat: add 'avail', fix 'free' The meaning of the `free` field is currently `zfs_arc_sys_free`, which is the target amount of memory to leave free for the system, and is constant after booting. This commit changes the meaning of `free` to arc_free_memory(), the amount of memory that the ARC considers to be free. It also adds a new arcstat field `avail`, which tracks `arc_available_memory()`. Since `avail` can be negative, it also updates the arcstat script to pretty-print negative values. example output: $ arcstat -f time,miss,arcsz,c,grow,need,free,avail 1 time miss arcsz c grow need free avail 15:03:02 39K 114G 114G 0 0 2.4G 407M 15:03:03 42K 114G 114G 0 0 2.1G 120M 15:03:04 40K 114G 114G 0 0 1.8G -177M 15:03:05 24K 113G 112G 0 0 1.7G -269M 15:03:06 29K 111G 110G 0 0 1.6G -385M 15:03:07 27K 110G 108G 0 0 1.4G -535M 15:03:08 13K 108G 108G 0 0 2.2G 239M 15:03:09 33K 107G 107G 0 0 1.3G -639M 15:03:10 16K 105G 102G 0 0 2.6G 704M 15:03:11 7.2K 102G 102G 0 0 5.1G 3.1G 15:03:12 42K 103G 102G 0 0 4.8G 2.8G Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #10494
2020-06-27 04:05:28 +03:00
The ARC's idea of how much free memory there is, which includes evictable memory in the page cache.
Since the ARC tries to keep \fBavail\fR above zero, \fBavail\fR is usually more instructive to observe than \fBfree\fR.
.RE
.sp
.ne 2
.na
\fBavail \fR
.ad
.RS 14n
The ARC's idea of how much free memory is available to it, which is a bit less than \fBfree\fR.
May temporarily be negative, in which case the ARC will reduce the target size \fBc\fR.
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
.RE
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.\"
.SH OPTIONS
.LP
The following options are supported:
arcstat: Add -a and -p options from FreeNAS Added -a option to automatically print all valid statistics. Added -p option to suppress scaling of printed data. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Authored by: Nick Principe <32284693+powernap@users.noreply.github.com> Ported-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #11090
2020-10-22 00:09:14 +03:00
.sp
.ne 2
.na
\fB\fB-a\fR\fR
.ad
.RS 12n
Print all possible stats.
.RE
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.sp
.ne 2
.na
\fB\fB-f\fR\fR
.ad
.RS 12n
Display only specific fields. See \fBDESCRIPTION\fR for supported statistics.
.RE
.sp
.ne 2
.na
\fB\fB-h\fR\fR
.ad
.RS 12n
Display help message.
.RE
.sp
.ne 2
.na
\fB\fB-o\fR\fR
.ad
.RS 12n
Report statistics to a file instead of the standard output.
.RE
arcstat: Add -a and -p options from FreeNAS Added -a option to automatically print all valid statistics. Added -p option to suppress scaling of printed data. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Authored by: Nick Principe <32284693+powernap@users.noreply.github.com> Ported-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #11090
2020-10-22 00:09:14 +03:00
.sp
.ne 2
.na
\fB\fB-p\fR\fR
.ad
.RS 12n
Disable auto-scaling of numerical fields (for raw, machine-parsable values).
.RE
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
.sp
.ne 2
.na
\fB\fB-s\fR\fR
.ad
.RS 12n
Display data with a specified separator (default: 2 spaces).
.RE
.sp
.ne 2
.na
\fB\fB-x\fR\fR
.ad
.RS 12n
Print extended stats (same as -f time,mfu,mru,mfug,mrug,eskip,mtxmis,dread,pread,read).
.RE
.sp
.ne 2
.na
\fB\fB-v\fR\fR
.ad
.RS 12n
Show field headers and definitions
.RE
.SH OPERANDS
.LP
The following operands are supported:
.sp
.ne 2
.na
\fB\fIcount\fR\fR
.ad
.RS 12n
Display only \fIcount\fR reports.
.RE
.sp
.ne 2
.na
\fB\fIinterval\fR\fR
.ad
.RS 12n
Specify the sampling interval in seconds.
.RE
.SH AUTHORS
.LP
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
arcstat was originally written in Perl by Neelakanth Nadgir and supported only ZFS ARC statistics.
Import the arcstat(1m) manpage from illumos And move it from section 1m to section 1 for consistency. Imported from illumos commit f34d737f. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 05:23:46 +03:00
Mike Harsch updated it to support L2ARC statistics.
Fix up arcstat(1) to match our version Turns out the illumos manpage, which is what this originates from, was written for the original Perl version of the utility which is not the version in the OpenZFS tree. *That* version originates from a Python rewrite that was done for FreeNAS. So fix up the manpage to match what we actually ship (and fix a few typos in the process). Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: AJ Jordan <alex@strugee.net> Closes #10288
2020-05-04 10:49:33 +03:00
John Hixson ported it to Python for FreeNAS over some beer, after which many individuals from the OpenZFS community continued to maintain and improve it.
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