mirror of
https://git.proxmox.com/git/mirror_zfs
synced 2025-11-04 12:35:20 +00:00
b46be903fb
Correct new mandoc errors. ``` STYLE: input text line longer than 80 bytes STYLE: no blank before trailing delimiter ``` Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: szubersk <szuberskidamian@gmail.com> Closes #14148
307 lines
9.6 KiB
Groff
307 lines
9.6 KiB
Groff
.\"
|
|
.\" CDDL HEADER START
|
|
.\"
|
|
.\" The contents of this file are subject to the terms of the
|
|
.\" Common Development and Distribution License (the "License").
|
|
.\" You may not use this file except in compliance with the License.
|
|
.\"
|
|
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
.\" or https://opensource.org/licenses/CDDL-1.0.
|
|
.\" See the License for the specific language governing permissions
|
|
.\" and limitations under the License.
|
|
.\"
|
|
.\" When distributing Covered Code, include this CDDL HEADER in each
|
|
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
.\" If applicable, add the following below this CDDL HEADER, with the
|
|
.\" fields enclosed by brackets "[]" replaced with your own identifying
|
|
.\" information: Portions Copyright [yyyy] [name of copyright owner]
|
|
.\"
|
|
.\" CDDL HEADER END
|
|
.\"
|
|
.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
|
|
.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
|
|
.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
|
|
.\" Copyright (c) 2017 Datto Inc.
|
|
.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
|
|
.\" Copyright 2017 Nexenta Systems, Inc.
|
|
.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
|
|
.\"
|
|
.Dd March 16, 2022
|
|
.Dt ZPOOL-IOSTAT 8
|
|
.Os
|
|
.
|
|
.Sh NAME
|
|
.Nm zpool-iostat
|
|
.Nd display logical I/O statistics for ZFS storage pools
|
|
.Sh SYNOPSIS
|
|
.Nm zpool
|
|
.Cm iostat
|
|
.Op Oo Oo Fl c Ar SCRIPT Oc Oo Fl lq Oc Oc Ns | Ns Fl rw
|
|
.Op Fl T Sy u Ns | Ns Sy d
|
|
.Op Fl ghHLnpPvy
|
|
.Oo Ar pool Ns … Ns | Ns Oo Ar pool vdev Ns … Oc Ns | Ns Ar vdev Ns … Oc
|
|
.Op Ar interval Op Ar count
|
|
.
|
|
.Sh DESCRIPTION
|
|
Displays logical I/O statistics for the given pools/vdevs.
|
|
Physical I/O statistics may be observed via
|
|
.Xr iostat 1 .
|
|
If writes are located nearby, they may be merged into a single
|
|
larger operation.
|
|
Additional I/O may be generated depending on the level of vdev redundancy.
|
|
To filter output, you may pass in a list of pools, a pool and list of vdevs
|
|
in that pool, or a list of any vdevs from any pool.
|
|
If no items are specified, statistics for every pool in the system are shown.
|
|
When given an
|
|
.Ar interval ,
|
|
the statistics are printed every
|
|
.Ar interval
|
|
seconds until killed.
|
|
If
|
|
.Fl n
|
|
flag is specified the headers are displayed only once, otherwise they are
|
|
displayed periodically.
|
|
If
|
|
.Ar count
|
|
is specified, the command exits after
|
|
.Ar count
|
|
reports are printed.
|
|
The first report printed is always the statistics since boot regardless of
|
|
whether
|
|
.Ar interval
|
|
and
|
|
.Ar count
|
|
are passed.
|
|
However, this behavior can be suppressed with the
|
|
.Fl y
|
|
flag.
|
|
Also note that the units of
|
|
.Sy K ,
|
|
.Sy M ,
|
|
.Sy G Ns …
|
|
that are printed in the report are in base 1024.
|
|
To get the raw values, use the
|
|
.Fl p
|
|
flag.
|
|
.Bl -tag -width Ds
|
|
.It Fl c Op Ar SCRIPT1 Ns Oo , Ns Ar SCRIPT2 Oc Ns …
|
|
Run a script (or scripts) on each vdev and include the output as a new column
|
|
in the
|
|
.Nm zpool Cm iostat
|
|
output.
|
|
Users can run any script found in their
|
|
.Pa ~/.zpool.d
|
|
directory or from the system
|
|
.Pa /etc/zfs/zpool.d
|
|
directory.
|
|
Script names containing the slash
|
|
.Pq Sy /
|
|
character are not allowed.
|
|
The default search path can be overridden by setting the
|
|
.Sy ZPOOL_SCRIPTS_PATH
|
|
environment variable.
|
|
A privileged user can only run
|
|
.Fl c
|
|
if they have the
|
|
.Sy ZPOOL_SCRIPTS_AS_ROOT
|
|
environment variable set.
|
|
If a script requires the use of a privileged command, like
|
|
.Xr smartctl 8 ,
|
|
then it's recommended you allow the user access to it in
|
|
.Pa /etc/sudoers
|
|
or add the user to the
|
|
.Pa /etc/sudoers.d/zfs
|
|
file.
|
|
.Pp
|
|
If
|
|
.Fl c
|
|
is passed without a script name, it prints a list of all scripts.
|
|
.Fl c
|
|
also sets verbose mode
|
|
.No \&( Ns Fl v Ns No \&) .
|
|
.Pp
|
|
Script output should be in the form of "name=value".
|
|
The column name is set to "name" and the value is set to "value".
|
|
Multiple lines can be used to output multiple columns.
|
|
The first line of output not in the
|
|
"name=value" format is displayed without a column title,
|
|
and no more output after that is displayed.
|
|
This can be useful for printing error messages.
|
|
Blank or NULL values are printed as a '-' to make output AWKable.
|
|
.Pp
|
|
The following environment variables are set before running each script:
|
|
.Bl -tag -compact -width "VDEV_ENC_SYSFS_PATH"
|
|
.It Sy VDEV_PATH
|
|
Full path to the vdev
|
|
.It Sy VDEV_UPATH
|
|
Underlying path to the vdev
|
|
.Pq Pa /dev/sd* .
|
|
For use with device mapper, multipath, or partitioned vdevs.
|
|
.It Sy VDEV_ENC_SYSFS_PATH
|
|
The sysfs path to the enclosure for the vdev (if any).
|
|
.El
|
|
.It Fl T Sy u Ns | Ns Sy d
|
|
Display a time stamp.
|
|
Specify
|
|
.Sy u
|
|
for a printed representation of the internal representation of time.
|
|
See
|
|
.Xr time 2 .
|
|
Specify
|
|
.Sy d
|
|
for standard date format.
|
|
See
|
|
.Xr date 1 .
|
|
.It Fl g
|
|
Display vdev GUIDs instead of the normal device names.
|
|
These GUIDs can be used in place of device names for the zpool
|
|
detach/offline/remove/replace commands.
|
|
.It Fl H
|
|
Scripted mode.
|
|
Do not display headers, and separate fields by a
|
|
single tab instead of arbitrary space.
|
|
.It Fl L
|
|
Display real paths for vdevs resolving all symbolic links.
|
|
This can be used to look up the current block device name regardless of the
|
|
.Pa /dev/disk/
|
|
path used to open it.
|
|
.It Fl n
|
|
Print headers only once when passed
|
|
.It Fl p
|
|
Display numbers in parsable (exact) values.
|
|
Time values are in nanoseconds.
|
|
.It Fl P
|
|
Display full paths for vdevs instead of only the last component of the path.
|
|
This can be used in conjunction with the
|
|
.Fl L
|
|
flag.
|
|
.It Fl r
|
|
Print request size histograms for the leaf vdev's I/O.
|
|
This includes histograms of individual I/O (ind) and aggregate I/O (agg).
|
|
These stats can be useful for observing how well I/O aggregation is working.
|
|
Note that TRIM I/O may exceed 16M, but will be counted as 16M.
|
|
.It Fl v
|
|
Verbose statistics Reports usage statistics for individual vdevs within the
|
|
pool, in addition to the pool-wide statistics.
|
|
.It Fl y
|
|
Normally the first line of output reports the statistics since boot:
|
|
suppress it.
|
|
.It Fl w
|
|
Display latency histograms:
|
|
.Bl -tag -compact -width "asyncq_read/write"
|
|
.It Sy total_wait
|
|
Total I/O time (queuing + disk I/O time).
|
|
.It Sy disk_wait
|
|
Disk I/O time (time reading/writing the disk).
|
|
.It Sy syncq_wait
|
|
Amount of time I/O spent in synchronous priority queues.
|
|
Does not include disk time.
|
|
.It Sy asyncq_wait
|
|
Amount of time I/O spent in asynchronous priority queues.
|
|
Does not include disk time.
|
|
.It Sy scrub
|
|
Amount of time I/O spent in scrub queue.
|
|
Does not include disk time.
|
|
.It Sy rebuild
|
|
Amount of time I/O spent in rebuild queue.
|
|
Does not include disk time.
|
|
.El
|
|
.It Fl l
|
|
Include average latency statistics:
|
|
.Bl -tag -compact -width "asyncq_read/write"
|
|
.It Sy total_wait
|
|
Average total I/O time (queuing + disk I/O time).
|
|
.It Sy disk_wait
|
|
Average disk I/O time (time reading/writing the disk).
|
|
.It Sy syncq_wait
|
|
Average amount of time I/O spent in synchronous priority queues.
|
|
Does not include disk time.
|
|
.It Sy asyncq_wait
|
|
Average amount of time I/O spent in asynchronous priority queues.
|
|
Does not include disk time.
|
|
.It Sy scrub
|
|
Average queuing time in scrub queue.
|
|
Does not include disk time.
|
|
.It Sy trim
|
|
Average queuing time in trim queue.
|
|
Does not include disk time.
|
|
.It Sy rebuild
|
|
Average queuing time in rebuild queue.
|
|
Does not include disk time.
|
|
.El
|
|
.It Fl q
|
|
Include active queue statistics.
|
|
Each priority queue has both pending
|
|
.Sy ( pend )
|
|
and active
|
|
.Sy ( activ )
|
|
I/O requests.
|
|
Pending requests are waiting to be issued to the disk,
|
|
and active requests have been issued to disk and are waiting for completion.
|
|
These stats are broken out by priority queue:
|
|
.Bl -tag -compact -width "asyncq_read/write"
|
|
.It Sy syncq_read/write
|
|
Current number of entries in synchronous priority
|
|
queues.
|
|
.It Sy asyncq_read/write
|
|
Current number of entries in asynchronous priority queues.
|
|
.It Sy scrubq_read
|
|
Current number of entries in scrub queue.
|
|
.It Sy trimq_write
|
|
Current number of entries in trim queue.
|
|
.It Sy rebuildq_write
|
|
Current number of entries in rebuild queue.
|
|
.El
|
|
.Pp
|
|
All queue statistics are instantaneous measurements of the number of
|
|
entries in the queues.
|
|
If you specify an interval,
|
|
the measurements will be sampled from the end of the interval.
|
|
.El
|
|
.
|
|
.Sh EXAMPLES
|
|
.\" These are, respectively, examples 13, 16 from zpool.8
|
|
.\" Make sure to update them bidirectionally
|
|
.Ss Example 13 : No Adding Cache Devices to a ZFS Pool
|
|
The following command adds two disks for use as cache devices to a ZFS storage
|
|
pool:
|
|
.Dl # Nm zpool Cm add Ar pool Sy cache Pa sdc sdd
|
|
.Pp
|
|
Once added, the cache devices gradually fill with content from main memory.
|
|
Depending on the size of your cache devices, it could take over an hour for
|
|
them to fill.
|
|
Capacity and reads can be monitored using the
|
|
.Cm iostat
|
|
subcommand as follows:
|
|
.Dl # Nm zpool Cm iostat Fl v Ar pool 5
|
|
.
|
|
.Ss Example 16 : No Adding output columns
|
|
Additional columns can be added to the
|
|
.Nm zpool Cm status No and Nm zpool Cm iostat No output with Fl c .
|
|
.Bd -literal -compact -offset Ds
|
|
.No # Nm zpool Cm status Fl c Pa vendor , Ns Pa model , Ns Pa size
|
|
NAME STATE READ WRITE CKSUM vendor model size
|
|
tank ONLINE 0 0 0
|
|
mirror-0 ONLINE 0 0 0
|
|
U1 ONLINE 0 0 0 SEAGATE ST8000NM0075 7.3T
|
|
U10 ONLINE 0 0 0 SEAGATE ST8000NM0075 7.3T
|
|
U11 ONLINE 0 0 0 SEAGATE ST8000NM0075 7.3T
|
|
U12 ONLINE 0 0 0 SEAGATE ST8000NM0075 7.3T
|
|
U13 ONLINE 0 0 0 SEAGATE ST8000NM0075 7.3T
|
|
U14 ONLINE 0 0 0 SEAGATE ST8000NM0075 7.3T
|
|
|
|
.No # Nm zpool Cm iostat Fl vc Pa size
|
|
capacity operations bandwidth
|
|
pool alloc free read write read write size
|
|
---------- ----- ----- ----- ----- ----- ----- ----
|
|
rpool 14.6G 54.9G 4 55 250K 2.69M
|
|
sda1 14.6G 54.9G 4 55 250K 2.69M 70G
|
|
---------- ----- ----- ----- ----- ----- ----- ----
|
|
.Ed
|
|
.
|
|
.Sh SEE ALSO
|
|
.Xr iostat 1 ,
|
|
.Xr smartctl 8 ,
|
|
.Xr zpool-list 8 ,
|
|
.Xr zpool-status 8
|