This is the command zhack that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 [-c cachefile] [-d dir] <subcommand> [arguments]
OPTIONS
-c cachefile
Read the pool configuration from the cachefile, which is /etc/zfs/zpool.cache by
default.
-d dir
Search for pool members in the dir path. Can be specified more than once.
SUBCOMMANDS
feature stat pool
List feature flags.
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 switch indicates that pool can be safely opened in read-only mode by a
system that does not have the guid feature.
feature ref [-d|-m] pool guid
Increment the reference count of the guid feature in pool.
The -d switch decrements the reference count of the guid feature in pool.
The -m switch indicates that the guid feature is now required to read the pool MOS.
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
AUTHORS
This man page was written by Darik Horn <dajhorn@vanadac.com>.
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