====== ZFS - Pools - Add Intent Logs to a Pool ======

ZIL (ZFS Intent Log) drives can be added to a ZFS pool to speed up the write capabilities of any level of ZFS RAID.

  * One normally would use a fast SSD for the ZIL.
  * Conceptually, ZIL is a logging mechanism where data and metadata to be the written is stored, then later flushed as a transactional write.
  * In reality, the ZIL is more complex than this.
  * One or more drives can be used for the ZIL.

----

===== Add a drive to the pool for ZIL =====

<code bash>
sudo zpool add testpool log /dev/sdg -f
</code>

<WRAP info>
**NOTE:**   This can speed up writes.

  * Typically a fast disk like an SSD will be used.

</WRAP>