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Add multihost=on|off pool property to control MMP. When enabled a new thread writes uberblocks to the last slot in each label, at a set frequency, to indicate to other hosts the pool is actively imported. These uberblocks are the last synced uberblock with an updated timestamp. Property defaults to off. During tryimport, find the "best" uberblock (newest txg and timestamp) repeatedly, checking for change in the found uberblock. Include the results of the activity test in the config returned by tryimport. These results are reported to user in "zpool import". Allow the user to control the period between MMP writes, and the duration of the activity test on import, via a new module parameter zfs_multihost_interval. The period is specified in milliseconds. The activity test duration is calculated from this value, and from the mmp_delay in the "best" uberblock found initially. Add a kstat interface to export statistics about Multiple Modifier Protection (MMP) updates. Include the last synced txg number, the timestamp, the delay since the last MMP update, the VDEV GUID, the VDEV label that received the last MMP update, and the VDEV path. Abbreviated output below. $ cat /proc/spl/kstat/zfs/mypool/multihost 31 0 0x01 10 880 105092382393521 105144180101111 txg timestamp mmp_delay vdev_guid vdev_label vdev_path 20468 261337 250274925 68396651780 3 /dev/sda 20468 261339 252023374 6267402363293 1 /dev/sdc 20468 261340 252000858 6698080955233 1 /dev/sdx 20468 261341 251980635 783892869810 2 /dev/sdy 20468 261342 253385953 8923255792467 3 /dev/sdd 20468 261344 253336622 042125143176 0 /dev/sdab 20468 261345 253310522 1200778101278 2 /dev/sde 20468 261346 253286429 0950576198362 2 /dev/sdt 20468 261347 253261545 96209817917 3 /dev/sds 20468 261349 253238188 8555725937673 3 /dev/sdb Add a new tunable zfs_multihost_history to specify the number of MMP updates to store history for. By default it is set to zero meaning that no MMP statistics are stored. When using ztest to generate activity, for automated tests of the MMP function, some test functions interfere with the test. For example, the pool is exported to run zdb and then imported again. Add a new ztest function, "-M", to alter ztest behavior to prevent this. Add new tests to verify the new functionality. Tests provided by Giuseppe Di Natale. Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279
176 lines
5.3 KiB
Groff
176 lines
5.3 KiB
Groff
'\" t
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.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or http://www.opensolaris.org/os/licensing.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\"
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.\" Copyright (c) 2009 Oracle and/or its affiliates. All rights reserved.
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.\" Copyright (c) 2009 Michael Gebetsroither <michael.geb@gmx.at>. All rights
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.\" reserved.
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.\"
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.TH ztest 1 "2009 NOV 01" "ZFS on Linux" "User Commands"
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.SH NAME
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\fBztest\fR \- was written by the ZFS Developers as a ZFS unit test.
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.SH SYNOPSIS
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.LP
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.BI "ztest <options>"
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.SH DESCRIPTION
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.LP
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This manual page documents briefly the \fBztest\fR command.
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.LP
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\fBztest\fR was written by the ZFS Developers as a ZFS unit test. The
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tool was developed in tandem with the ZFS functionality and was
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executed nightly as one of the many regression test against the daily
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build. As features were added to ZFS, unit tests were also added to
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\fBztest\fR. In addition, a separate test development team wrote and
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executed more functional and stress tests.
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.LP
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By default \fBztest\fR runs for ten minutes and uses block files
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(stored in /tmp) to create pools rather than using physical disks.
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Block files afford \fBztest\fR its flexibility to play around with
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zpool components without requiring large hardware configurations.
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However, storing the block files in /tmp may not work for you if you
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have a small tmp directory.
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.LP
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By default is non-verbose. This is why entering the command above will
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result in \fBztest\fR quietly executing for 5 minutes. The -V option
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can be used to increase the verbosity of the tool. Adding multiple -V
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option is allowed and the more you add the more chatty \fBztest\fR
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becomes.
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.LP
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After the \fBztest\fR run completes, you should notice many ztest.*
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files lying around. Once the run completes you can safely remove these
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files. Note that you shouldn't remove these files during a run. You
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can re-use these files in your next \fBztest\fR run by using the -E
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option.
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.SH OPTIONS
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.HP
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.BI "\-?" ""
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.IP
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Print a help summary.
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.HP
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.BI "\-v" " vdevs" " (default: 5)
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.IP
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Number of vdevs.
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.HP
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.BI "\-s" " size_of_each_vdev" " (default: 64M)"
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.IP
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Size of each vdev.
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.HP
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.BI "\-a" " alignment_shift" " (default: 9) (use 0 for random)"
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.IP
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Used alignment in test.
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.HP
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.BI "\-m" " mirror_copies" " (default: 2)"
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.IP
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Number of mirror copies.
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.HP
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.BI "\-r" " raidz_disks" " (default: 4)"
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.IP
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Number of raidz disks.
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.HP
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.BI "\-R" " raidz_parity" " (default: 1)"
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.IP
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Raidz parity.
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.HP
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.BI "\-d" " datasets" " (default: 7)"
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.IP
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Number of datasets.
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.HP
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.BI "\-t" " threads" " (default: 23)"
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.IP
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Number of threads.
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.HP
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.BI "\-g" " gang_block_threshold" " (default: 32K)"
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.IP
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Gang block threshold.
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.HP
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.BI "\-i" " initialize_pool_i_times" " (default: 1)"
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.IP
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Number of pool initialisations.
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.HP
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.BI "\-k" " kill_percentage" " (default: 70%)"
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.IP
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Kill percentage.
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.HP
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.BI "\-p" " pool_name" " (default: ztest)"
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.IP
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Pool name.
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.HP
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.BI "\-V(erbose)"
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.IP
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Verbose (use multiple times for ever more blather).
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.HP
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.BI "\-E(xisting)"
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.IP
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Use existing pool (use existing pool instead of creating new one).
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.HP
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.BI "\-T" " time" " (default: 300 sec)"
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.IP
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Total test run time.
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.HP
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.BI "\-z" " zil_failure_rate" " (default: fail every 2^5 allocs)
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.IP
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Injected failure rate.
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.SH "EXAMPLES"
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.LP
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To override /tmp as your location for block files, you can use the -f
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option:
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.IP
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ztest -f /
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.LP
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To get an idea of what ztest is actually testing try this:
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.IP
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ztest -f / -VVV
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.LP
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Maybe you'd like to run ztest for longer? To do so simply use the -T
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option and specify the runlength in seconds like so:
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.IP
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ztest -f / -V -T 120
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.SH "ENVIRONMENT VARIABLES"
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.TP
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.B "ZFS_HOSTID=id"
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Use \fBid\fR instead of the SPL hostid to identify this host. Intended for use
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with ztest, but this environment variable will affect any utility which uses
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libzpool, including \fBzpool(8)\fR. Since the kernel is unaware of this setting
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results with utilites other than ztest are undefined.
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.TP
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.B "ZFS_STACK_SIZE=stacksize"
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Limit the default stack size to \fBstacksize\fR bytes for the purpose of
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detecting and debugging kernel stack overflows. This value defaults to
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\fB32K\fR which is double the default \fB16K\fR Linux kernel stack size.
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In practice, setting the stack size slightly higher is needed because
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differences in stack usage between kernel and user space can lead to spurious
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stack overflows (especially when debugging is enabled). The specified value
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will be rounded up to a floor of PTHREAD_STACK_MIN which is the minimum stack
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required for a NULL procedure in user space.
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By default the stack size is limited to 256K.
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.SH "SEE ALSO"
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.BR "spl-module-parameters (5)" ","
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.BR "zpool (1)" ","
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.BR "zfs (1)" ","
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.BR "zdb (1)" ","
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.SH "AUTHOR"
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This manual page was transvered to asciidoc by Michael Gebetsroither
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<gebi@grml.org> from http://opensolaris.org/os/community/zfs/ztest/
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