2013-03-17 00:54:32 +04:00
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\"
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.\" CDDL HEADER END
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.\"
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.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
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.\"
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2021-05-26 17:46:48 +03:00
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.\" lint-ok: WARNING: sections out of conventional order: Sh SYNOPSIS
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.\"
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.Dd May 26, 2021
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.Dt ZHACK 1
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.Os
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.
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.Sh NAME
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.Nm zhack
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.Nd libzpool debugging tool
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.Sh DESCRIPTION
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2013-03-17 00:54:32 +04:00
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This utility pokes configuration changes directly into a ZFS pool,
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which is dangerous and can cause data corruption.
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2021-05-26 17:46:48 +03:00
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.Sh SYNOPSIS
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.Bl -tag -width Ds
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.It Xo
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.Nm zhack
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.Cm feature stat
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.Ar pool
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.Xc
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2013-03-17 00:54:32 +04:00
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List feature flags.
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.
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.It Xo
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.Nm zhack
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.Cm feature enable
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.Op Fl d Ar description
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.Op Fl r
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.Ar pool
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.Ar guid
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.Xc
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Add a new feature to
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.Ar pool
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that is uniquely identified by
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.Ar guid ,
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which is specified in the same form as a
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.Xr zfs 8
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user property.
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.Pp
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The
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.Ar description
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is a short human readable explanation of the new feature.
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.Pp
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The
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.Fl r
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flag indicates that
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.Ar pool
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can be safely opened in read-only mode by a system that does not understand the
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.Ar guid
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2013-03-17 00:54:32 +04:00
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feature.
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.
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.It Xo
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.Nm zhack
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.Cm feature ref
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.Op Fl d Ns | Ns Fl m
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.Ar pool
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.Ar guid
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.Xc
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Increment the reference count of the
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.Ar guid
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feature in
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.Ar pool .
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.Pp
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The
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.Fl d
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flag decrements the reference count of the
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.Ar guid
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feature in
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.Ar pool
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instead.
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.Pp
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The
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.Fl m
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flag indicates that the
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.Ar guid
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feature is now required to read the pool MOS.
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2021-11-11 22:26:18 +03:00
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.
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.It Xo
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.Nm zhack
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.Cm label repair
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.Ar device
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.Xc
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Repair corrupted labels by rewriting the checksum using the presumed valid contents of the label.
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2021-05-26 17:46:48 +03:00
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.El
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.
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.Sh GLOBAL OPTIONS
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The following can be passed to all
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.Nm
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invocations before any subcommand:
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.Bl -tag -width "-d dir"
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.It Fl c Ar cachefile
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Read
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.Ar pool
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configuration from the
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.Ar cachefile ,
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which is
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.Pa /etc/zfs/zpool.cache
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by default.
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.It Fl d Ar dir
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Search for
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.Ar pool
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members in
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.Ar dir .
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Can be specified more than once.
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.El
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.
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.Sh EXAMPLES
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.Bd -literal
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2021-06-04 23:08:50 +03:00
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.No # Nm zhack Cm feature stat Ar tank
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2013-03-17 00:54:32 +04:00
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for_read_obj:
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org.illumos:lz4_compress = 0
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for_write_obj:
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com.delphix:async_destroy = 0
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com.delphix:empty_bpobj = 0
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descriptions_obj:
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com.delphix:async_destroy = Destroy filesystems asynchronously.
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com.delphix:empty_bpobj = Snapshots use less space.
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org.illumos:lz4_compress = LZ4 compression algorithm support.
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2021-05-26 17:46:48 +03:00
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2021-06-04 23:08:50 +03:00
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.No # Nm zhack Cm feature enable Fl d No 'Predict future disk failures.' Ar tank com.example:clairvoyance
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.No # Nm zhack Cm feature ref Ar tank com.example:clairvoyance
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2021-05-26 17:46:48 +03:00
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.Ed
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.
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.Sh SEE ALSO
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.Xr ztest 1 ,
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2021-06-04 23:29:26 +03:00
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.Xr zpool-features 7 ,
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2021-05-26 17:46:48 +03:00
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.Xr zfs 8
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