---
name: "raidz_test"
section: "1"
platform: "linux"
package: "zfs-test"
version: "2.3.9-0+deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/raidz_test"
---

# raidz\_test(1)

raidz implementation verification and benchmarking tool

## NAME

**raidz\_test** – raidz implementation verification and benchmarking tool

## SYNOPSIS

**raidz\_test** \[**-StBevTD**\] \[**-a** *ashift*\] \[**-o** *zio\_off\_shift*\] \[**-d** *raidz\_data\_disks*\] \[**-s** *zio\_size\_shift*\] \[**-r** *reflow\_offset*\]

## DESCRIPTION

The purpose of this tool is to run all supported raidz implementation and verify the results of all methods. It also contains a parameter sweep option where all parameters affecting a RAID-Z block are verified (like ashift size, data offset, data size, etc.). The tool also supports a benchmarking mode using the **-B** option.

## OPTION

- **-h**

  Print a help summary.

- **-a** *ashift* (default: **9**)

  Ashift value.

- **-o** *zio\_off\_shift* (default: **0**)

  ZIO offset for each raidz block. The offset's value is *2^zio\_off\_shift*.

- **-d** *raidz\_data\_disks* (default: **8**)

  Number of raidz data disks to use. Additional disks will be used for parity.

- **-s** *zio\_size\_shift* (default: **19**)

  Size of data for raidz block. The real size is *2^zio\_size\_shift*.

- **-r** *reflow\_offset* (default: **uint** **max**)

  Set raidz expansion offset. The expanded raidz map allocation function will produce different map configurations depending on this value.

- **-S**(weep)

  Sweep parameter space while verifying the raidz implementations. This option will exhaust all most of valid values for the **-aods** options. Runtime using this option will be long.

- **-t**(imeout)

  Wall time for sweep test in seconds. The actual runtime could be longer.

- **-B**(enchmark)

  All implementations are benchmarked using increasing per disk data size. Results are given as throughput per disk, measured in MiB/s.

- **-e**(xpansion)

  Use expanded raidz map allocation function.

- **-v**(erbose)

  Increase verbosity.

- **-T**(est the test)

  Debugging option: fail all tests. This is to check if tests would properly verify bit-exactness.

- **-D**(ebug)

  Debugging option: attach [gdb(1)](/gdb/1.md) when **SIGSEGV** or **SIGABRT** are received.

## SEE ALSO

[ztest(1)](/ztest/1.md)