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d04b5c9e87
In case if all label checksums will be invalid on any vdev, the pool will become unimportable. The zhack with newly added cli options could be used to restore label checksums and make pool importable again. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Fedor Uporov <fuporov.vstack@gmail.com> Closes #2510 Closes #12686
148 lines
3.1 KiB
Groff
148 lines
3.1 KiB
Groff
.\"
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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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.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
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.\"
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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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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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.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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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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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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.
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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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.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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.No # Nm zhack Cm feature stat Ar tank
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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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.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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.Ed
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.
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.Sh SEE ALSO
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.Xr ztest 1 ,
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.Xr zpool-features 7 ,
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.Xr zfs 8
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