====== ZFS - Pools - Add a Cache Drive to a Pool ======

Cache drives add a layer of caching between RAM and the main storage drives.

  * Typically, a faster SSD should be used for caching.
  * They are especially useful to improve random-read performance of mainly static data.

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===== Add a Cache Drive to a Pool =====

<code bash>
sudo zpool add testpool cache /dev/sdh -f
</code>