zinject(8) ZFS Fault Injector


zinject creates artificial problems in a ZFS pool by simulating data corruption or device failures. This program is dangerous.


List injection records.
zinject -b objset:object:level:blkd [-f frequency] [-amu] pool
Force an error into the pool at a bookmark.
zinject -c <id | all>
Cancel injection records.
zinject -d vdev -A <degrade|fault> pool
Force a vdev into the DEGRADED or FAULTED state.
zinject -d vdev [-e device_error] [-L label_error] [-T failure] [-F] pool
Force a vdev error.
zinject -I [-s seconds | -g txgs] pool
Simulate a hardware failure that fails to honor a cache flush.
zinject -p function pool
Panic inside the specified function.
zinject -t data [-e device_error] [-f frequency] [-l level] [-r range] [-amq] path
Force an error into the contents of a file.
zinject -t dnode [-e device_error] [-f frequency] [-l level] [-amq] path
Force an error into the metadnode for a file or directory.
zinject -t mos_type [-e device_error] [-f frequency] [-l level] [-r range] [-amqu] pool
Force an error into the MOS of a pool.


Flush the ARC before injection.
-b objset:object:level:start:end
Force an error into the pool at this bookmark tuple. Each number is in hexidecimal, and only one block can be specified.
-d vdev
A vdev specified by path or GUID.
-e device_error
Specify checksum for an ECKSUM error, dtl for an ECHILD error, io for an EIO error where reopening the device will succeed, or nxio for an ENXIO error where reopening the device will fail.
-f frequency
Only inject errors a fraction of the time. Expressed as an integer percentage between 1 and 100.
Fail faster. Do fewer checks.
-g txgs
Run for this many transaction groups before reporting failure.
Print the usage message.
-l level
Inject an error at a particular block level. The default is 0.
-L label_error
Set the label error region to one of nvlist, pad1, pad2, or uber.
Automatically remount the underlying filesystem.
Quiet mode. Only print the handler number added.
-r range
Inject an error over a particular logical range of an object, which will be translated to the appropriate blkid range according to the object's properties.
-s seconds
Run for this many seconds before reporting failure.
-T failure
Set the failure type to one of all, claim, free, read, or write.
-t mos_type
Set this to mos for any data in the MOS, mosdir for an object directory, config for the pool configuration, bpobj for the block pointer list, spacemap for the space map, metaslab for the metaslab, or errlog for the persistent error log.
Unload the pool after injection.


Run zinject in debug mode.


This man page was written by Darik Horn <[email protected]> excerpting the zinject usage message and source code.