zhack.1
ZHACK(1) | General Commands Manual | ZHACK(1) |
NAME
zhack
— libzpool
debugging tool
DESCRIPTION
This utility pokes configuration changes directly into a ZFS pool, which is dangerous and can cause data corruption.
SYNOPSIS
-
zhack
feature stat
pool - List feature flags.
-
zhack
feature enable
[-d
description] [-r
] pool guid - Add a new feature to pool that is uniquely
identified by guid, which is specified in the same
form as a zfs(8) user property.
The description is a short human readable explanation of the new feature.
The
-r
flag indicates that pool can be safely opened in read-only mode by a system that does not understand the guid feature. -
zhack
feature ref
[-d
|-m
] pool guid - Increment the reference count of the guid feature in
pool.
The
-d
flag decrements the reference count of the guid feature in pool instead.The
-m
flag indicates that the guid feature is now required to read the pool MOS. -
zhack
label repair
[-cu
] device - Repair labels of a specified device according to
options.
Flags may be combined to do their functions simultaneously.
The
-c
flag repairs corrupted label checksumsThe
-u
flag restores the label on a detached deviceExample:
zhack
label repair
-cu
device
Fix checksums and undetach a device -
zhack
metaslab leak
[-f
] pool - Apply a fragmentation profile generated by
zdb to the
specified pool.
The
-f
flag forces the profile to apply even if the vdevs in the pool don't have the same number of metaslabs as the fragmentation profile.
GLOBAL OPTIONS
The following can be passed to all zhack
invocations before any subcommand:
EXAMPLES
#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. #zhack
feature enable
-d
'Predict future disk failures.' tank com.example:clairvoyance #zhack
feature ref
tank com.example:clairvoyance
SEE ALSO
May 3, 2023 | Debian |