FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/man/man1/ztest.1

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    .\" Copyright (c) 2009 Oracle and/or its affiliates. All rights reserved.
    .\" Copyright (c) 2009 Michael Gebetsroither <michael.geb@gmx.at>. All rights
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    .\" Copyright (c) 2017, Intel Corporation.
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    .Dd May 26, 2021
    .Dt ZTEST 1
    .Os
    .
    .Sh NAME
    .Nm ztest
    .Nd was written by the ZFS Developers as a ZFS unit test
    .Sh SYNOPSIS
    .Nm
    .Op Fl VEG
    .Op Fl v Ar vdevs
    .Op Fl s Ar size_of_each_vdev
    .Op Fl a Ar alignment_shift
    .Op Fl m Ar mirror_copies
    .Op Fl r Ar raidz_disks/draid_disks
    .Op Fl R Ar raid_parity
    .Op Fl K Ar raid_kind
    .Op Fl D Ar draid_data
    .Op Fl S Ar draid_spares
    .Op Fl C Ar vdev_class_state
    .Op Fl d Ar datasets
    .Op Fl t Ar threads
    .Op Fl g Ar gang_block_threshold
    .Op Fl i Ar initialize_pool_i_times
    .Op Fl k Ar kill_percentage
    .Op Fl p Ar pool_name
    .Op Fl T Ar time
    .Op Fl z Ar zil_failure_rate
    .
    .Sh DESCRIPTION
    .Nm
    was written by the ZFS Developers as a ZFS unit test.
    The tool was developed in tandem with the ZFS functionality and was
    executed nightly as one of the many regression test against the daily build.
    As features were added to ZFS, unit tests were also added to
    .Nm .
    In addition, a separate test development team wrote and
    executed more functional and stress tests.
    .
    .Pp
    By default
    .Nm
    runs for ten minutes and uses block files
    (stored in
    .Pa /tmp )
    to create pools rather than using physical disks.
    Block files afford
    .Nm
    its flexibility to play around with
    zpool components without requiring large hardware configurations.
    However, storing the block files in
    .Pa /tmp
    may not work for you if you
    have a small tmp directory.
    .
    .Pp
    By default is non-verbose.
    This is why entering the command above will result in
    .Nm
    quietly executing for 5 minutes.
    The
    .Fl V
    option can be used to increase the verbosity of the tool.
    Adding multiple
    .Fl V
    options is allowed and the more you add the more chatty
    .Nm
    becomes.
    .
    .Pp
    After the
    .Nm
    run completes, you should notice many
    .Pa ztest.*
   files lying around.
   Once the run completes you can safely remove these files.
   Note that you shouldn't remove these files during a run.
   You can re-use these files in your next
   .Nm
   run by using the
   .Fl E
   option.
   .
   .Sh OPTIONS
   .Bl -tag -width "-v v"
   .It Fl h , \&? , -help
   Print a help summary.
   .It Fl v , -vdevs Ns = (default: Sy 5 )
   Number of vdevs.
   .It Fl s , -vdev-size Ns = (default: Sy 64M )
   Size of each vdev.
   .It Fl a , -alignment-shift Ns = (default: Sy 9 ) No (use Sy 0 No for random )
   Alignment shift used in test.
   .It Fl m , -mirror-copies Ns = (default: Sy 2 )
   Number of mirror copies.
   .It Fl r , -raid-disks Ns = (default: Sy 4 No for raidz/ Ns Sy 16 No for draid )
   Number of raidz/draid disks.
   .It Fl R , -raid-parity Ns = (default: Sy 1 )
   Raid parity (raidz & draid).
   .It Fl K , -raid-kind Ns = Ns Sy raidz Ns | Ns Sy draid Ns | Ns Sy random No (default : Sy random )
   The kind of RAID config to use.
   With
   .Sy random
   the kind alternates between raidz and draid.
   .It Fl D , -draid-data Ns = (default: Sy 4 )
   Number of data disks in a dRAID redundancy group.
   .It Fl S , -draid-spares Ns = (default: Sy 1 )
   Number of dRAID distributed spare disks.
   .It Fl d , -datasets Ns = (default: Sy 7 )
   Number of datasets.
   .It Fl t , -threads Ns = (default: Sy 23 )
   Number of threads.
   .It Fl g , -gang-block-threshold Ns = (default: Sy 32K )
   Gang block threshold.
   .It Fl i , -init-count Ns = (default: Sy 1 )
   Number of pool initializations.
   .It Fl k , -kill-percentage Ns = (default: Sy 70% )
   Kill percentage.
   .It Fl p , -pool-name Ns = (default: Sy ztest )
   Pool name.
   .It Fl f , -vdev-file-directory Ns = (default: Pa /tmp )
   File directory for vdev files.
   .It Fl M , -multi-host
   Multi-host; simulate pool imported on remote host.
   .It Fl E , -use-existing-pool
   Use existing pool (use existing pool instead of creating new one).
   .It Fl T , -run-time Ns = (default: Sy 300 Ns s)
   Total test run time.
   .It Fl P , -pass-time Ns = (default: Sy 60 Ns s)
   Time per pass.
   .It Fl F , -freeze-loops Ns = (default: Sy 50 )
   Max loops in
   .Fn spa_freeze .
   .It Fl B , -alt-ztest Ns =
   Path to alternate ("older")
   .Nm ztest
   to drive, which will be used to initialise the pool, and, a stochastic half the
   time, to run the tests.
   The parallel
   .Pa lib
   directory is prepended to
   .Ev LD_LIBRARY_PATH ;
   i.e. given
   .Fl B Pa ./chroots/lenny/usr/bin/ Ns Nm ,
   .Pa ./chroots/lenny/usr/lib
   will be loaded.
   .It Fl C , -vdev-class-state Ns = Ns Sy on Ns | Ns Sy off Ns | Ns Sy random No (default : Sy random  )
   The vdev allocation class state.
   .It Fl o , -option Ns = Ns Ar variable Ns = Ns Ar value
   Set global
   .Ar variable
   to an unsigned 32-bit integer
   .Ar value
   (little-endian only).
   .It Fl G , -dump-debug
   Dump zfs_dbgmsg buffer before exiting due to an error.
   .It Fl V , -verbose
   Verbose (use multiple times for ever more verbosity).
   .El
   .
   .Sh EXAMPLES
   To override
   .Pa /tmp
   as your location for block files, you can use the
   .Fl f
   option:
   .Dl # ztest -f /
   .Pp
   To get an idea of what
   .Nm
   is actually testing try this:
   .Dl # ztest -f / -VVV
   .Pp
   Maybe you'd like to run
   .Nm ztest
   for longer? To do so simply use the
   .Fl T
   option and specify the runlength in seconds like so:
   .Dl # ztest -f / -V -T 120
   .
   .Sh ENVIRONMENT VARIABLES
   .Bl -tag -width "ZF"
   .It Ev ZFS_HOSTID Ns = Ns Em id
   Use
   .Em id
   instead of the SPL hostid to identify this host.
   Intended for use with
   .Nm , but this environment variable will affect any utility which uses
   libzpool, including
   .Xr zpool 8 .
   Since the kernel is unaware of this setting,
   results with utilities other than ztest are undefined.
   .It Ev ZFS_STACK_SIZE Ns = Ns Em stacksize
   Limit the default stack size to
   .Em stacksize
   bytes for the purpose of
   detecting and debugging kernel stack overflows.
   This value defaults to
   .Em 32K
   which is double the default
   .Em 16K
   Linux kernel stack size.
   .Pp
   In practice, setting the stack size slightly higher is needed because
   differences in stack usage between kernel and user space can lead to spurious
   stack overflows (especially when debugging is enabled).
   The specified value
   will be rounded up to a floor of PTHREAD_STACK_MIN which is the minimum stack
   required for a NULL procedure in user space.
   .Pp
   By default the stack size is limited to
   .Em 256K .
   .El
   .
   .Sh SEE ALSO
   .Xr zdb 1 ,
   .Xr zfs 1 ,
   .Xr zpool 1 ,
   .Xr spl 4

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