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89666a8e1c
Under RHEL6/CentOS6 the default stack size must be increased to 32K to prevent overflowing the stack when running ztest. This isn't an issue for other distributions due to either the version of pthreads or perhaps the compiler. Doubling the stack size resolves the issue safely for all distribution and leaves us some headroom. $ sudo -E ztest -V -T 300 -f /var/tmp/ 5 vdevs, 7 datasets, 23 threads, 300 seconds... loading space map for vdev 0 of 1, metaslab 0 of 30 ... ... loading space map for vdev 0 of 1, metaslab 14 of 30 ... child died with signal 11 Exited ztest with error 3 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4215
169 lines
5.0 KiB
Groff
169 lines
5.0 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_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 "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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