2013-03-17 00:54:32 +04:00
|
|
|
'\" t
|
|
|
|
|
.\"
|
|
|
|
|
.\" CDDL HEADER START
|
|
|
|
|
.\"
|
|
|
|
|
.\" The contents of this file are subject to the terms of the
|
|
|
|
|
.\" Common Development and Distribution License (the "License").
|
|
|
|
|
.\" You may not use this file except in compliance with the License.
|
|
|
|
|
.\"
|
|
|
|
|
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
|
|
|
.\" or http://www.opensolaris.org/os/licensing.
|
|
|
|
|
.\" See the License for the specific language governing permissions
|
|
|
|
|
.\" and limitations under the License.
|
|
|
|
|
.\"
|
|
|
|
|
.\" When distributing Covered Code, include this CDDL HEADER in each
|
|
|
|
|
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
|
|
|
.\" If applicable, add the following below this CDDL HEADER, with the
|
|
|
|
|
.\" fields enclosed by brackets "[]" replaced with your own identifying
|
|
|
|
|
.\" information: Portions Copyright [yyyy] [name of copyright owner]
|
|
|
|
|
.\"
|
|
|
|
|
.\" CDDL HEADER END
|
|
|
|
|
.\"
|
|
|
|
|
.\"
|
|
|
|
|
.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
|
|
|
|
|
.\"
|
2020-08-25 07:25:28 +03:00
|
|
|
.TH ZHACK 1 "Aug 24, 2020" OpenZFS
|
2014-03-05 14:07:02 +04:00
|
|
|
|
2013-03-17 00:54:32 +04:00
|
|
|
.SH NAME
|
2014-03-05 14:07:02 +04:00
|
|
|
zhack \- libzpool debugging tool
|
2013-03-17 00:54:32 +04:00
|
|
|
.SH DESCRIPTION
|
|
|
|
|
This utility pokes configuration changes directly into a ZFS pool,
|
|
|
|
|
which is dangerous and can cause data corruption.
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.LP
|
|
|
|
|
.BI "zhack [\-c " "cachefile" "] [\-d " "dir" "] <" "subcommand" "> [" "arguments" "]"
|
|
|
|
|
.SH OPTIONS
|
|
|
|
|
.HP
|
|
|
|
|
.BI "\-c" " cachefile"
|
|
|
|
|
.IP
|
|
|
|
|
Read the \fIpool\fR configuration from the \fIcachefile\fR, which is
|
|
|
|
|
/etc/zfs/zpool.cache by default.
|
|
|
|
|
.HP
|
|
|
|
|
.BI "\-d" " dir"
|
|
|
|
|
.IP
|
|
|
|
|
Search for \fIpool\fR members in the \fIdir\fR path. Can be specified
|
|
|
|
|
more than once.
|
|
|
|
|
.SH SUBCOMMANDS
|
|
|
|
|
.LP
|
|
|
|
|
.BI "feature stat " "pool"
|
|
|
|
|
.IP
|
|
|
|
|
List feature flags.
|
|
|
|
|
.LP
|
|
|
|
|
.BI "feature enable [\-d " "description" "] [\-r] " "pool guid"
|
|
|
|
|
.IP
|
|
|
|
|
Add a new feature to \fIpool\fR that is uniquely identified by
|
|
|
|
|
\fIguid\fR, which is specified in the same form as a zfs(8) user
|
|
|
|
|
property.
|
|
|
|
|
.IP
|
|
|
|
|
The \fIdescription\fR is a short human readable explanation of the new
|
|
|
|
|
feature.
|
|
|
|
|
.IP
|
|
|
|
|
The \fB\-r\fR switch indicates that \fIpool\fR can be safely opened
|
|
|
|
|
in read-only mode by a system that does not have the \fIguid\fR
|
|
|
|
|
feature.
|
|
|
|
|
.LP
|
|
|
|
|
.BI "feature ref [\-d|\-m] " "pool guid"
|
|
|
|
|
.IP
|
|
|
|
|
Increment the reference count of the \fIguid\fR feature in \fIpool\fR.
|
|
|
|
|
.IP
|
|
|
|
|
The \fB\-d\fR switch decrements the reference count of the \fIguid\fR
|
|
|
|
|
feature in \fIpool\fR.
|
|
|
|
|
.IP
|
|
|
|
|
The \fB\-m\fR switch indicates that the \fIguid\fR feature is now
|
|
|
|
|
required to read the pool MOS.
|
|
|
|
|
.SH EXAMPLES
|
|
|
|
|
.LP
|
|
|
|
|
.nf
|
|
|
|
|
# zhack feature stat tank
|
|
|
|
|
|
|
|
|
|
for_read_obj:
|
|
|
|
|
org.illumos:lz4_compress = 0
|
|
|
|
|
for_write_obj:
|
|
|
|
|
com.delphix:async_destroy = 0
|
|
|
|
|
com.delphix:empty_bpobj = 0
|
|
|
|
|
descriptions_obj:
|
|
|
|
|
com.delphix:async_destroy = Destroy filesystems asynchronously.
|
|
|
|
|
com.delphix:empty_bpobj = Snapshots use less space.
|
|
|
|
|
org.illumos:lz4_compress = LZ4 compression algorithm support.
|
|
|
|
|
.LP
|
|
|
|
|
# zhack feature enable -d 'Predict future disk failures.' \\
|
|
|
|
|
tank com.example:clairvoyance
|
|
|
|
|
.LP
|
|
|
|
|
# zhack feature ref tank com.example:clairvoyance
|
|
|
|
|
.SH AUTHORS
|
|
|
|
|
This man page was written by Darik Horn <dajhorn@vanadac.com>.
|
|
|
|
|
.SH SEE ALSO
|
|
|
|
|
.BR zfs (8),
|
|
|
|
|
.BR zpool-features (5),
|
|
|
|
|
.BR ztest (1)
|
