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ZINJECT(8) FreeBSD System Manager's Manual ZINJECT(8)
NAME zinject - ZFS Fault Injector
DESCRIPTION zinject creates artificial problems in a ZFS pool by simulating data corruption or device failures. This program is dangerous.
SYNOPSIS zinject List injection records.
zinject -b objset:object:level:start:end [-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 -D latency:lanes pool Add an artificial delay to I/O requests on a particular device, such that the requests take a minimum of latency milliseconds to complete. Each delay has an associated number of lanes which defines the number of concurrent I/O requests that can be processed.
For example, with a single lane delay of 10 ms (-D 10:1), the device will only be able to service a single I/O request at a time with each request taking 10 ms to complete. So, if only a single request is submitted every 10 ms, the average latency will be 10 ms; but if more than one request is submitted every 10 ms, the average latency will be more than 10 ms.
Similarly, if a delay of 10 ms is specified to have two lanes (-D 10:2), then the device will be able to service two requests at a time, each with a minimum latency of 10 ms. So, if two requests are submitted every 10 ms, then the average latency will be 10 ms; but if more than two requests are submitted every 10 ms, the average latency will be more than 10 ms.
Also note, these delays are additive. So two invocations of -D 10:1 are roughly equivalent to a single invocation of -D 10:2. This also means, that one can specify multiple lanes with differing target latencies. For example, an invocation of -D 10:1 followed by -D 25:2 will create 3 lanes on the device: one lane with a latency of 10 ms and two lanes with a 25 ms latency.
zinject -d vdev [-e device_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 -C dvas [-e device_error] [-f frequency] [-l level] [-r range] [-amq] path Force an error into the contents of a file.
zinject -t dnode -C dvas [-e device_error] [-f frequency] [-l level] [-amq] path Force an error into the metadnode for a file or directory.
zinject -t mos_type -C dvas [-e device_error] [-f frequency] [-l level] [-r range] [-amqu] pool Force an error into the MOS of a pool.
OPTIONS -a 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 hexadecimal, and only one block can be specified.
-C dvas Inject the given error only into specific DVAs. The mask should be specified as a list of 0-indexed DVAs separated by commas (e.g. 0,2). This option is not applicable to logical data errors such as decompress and decrypt.
-d vdev A vdev specified by path or GUID.
-e device_error Specify checksum for an ECKSUM error, decompress for a data decompression error, decrypt for a data decryption error, corrupt to flip a bit in the data after a read, dtl for an ECHILD error, pipeline so it appears the read or write failed. Decryption errors only currently work with file data.
-f frequency Only inject errors a fraction of the time. Expressed as a real number percentage between 0.0001 and 100.
-F Fail faster. Do fewer checks.
-f txgs Run for this many transaction groups before reporting failure.
-h 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.
-m Automatically remount the underlying filesystem.
-q 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.
-u Unload the pool after injection.
ENVIRONMENT VARIABLES ZFS_HOSTID Run zinject in debug mode.
SEE ALSO zfs(8), zpool(8)
FreeBSD 14.0-RELEASE-p11 May 26, 2021 FreeBSD 14.0-RELEASE-p11