I think he might just be glossing over some details? At any rate, from what I understand ZFS has a &#x27;zil&#x27; write cache for small log writes, and a l2arc for common reads that don&#x27;t fit into memory. This is just a dev setup, but for real work I think you&#x27;d want your zil to also be mirrored so you don&#x27;t lose writes if an ssd goes bad. For anyone interested this link has a few more details:
<a href="http:&#x2F;&#x2F;www.45drives.com&#x2F;wiki&#x2F;index.php&#x2F;FreeNAS_-_What_is_ZIL_%26_L2ARC" rel="nofollow">http:&#x2F;&#x2F;www.45drives.com&#x2F;wiki&#x2F;index.php&#x2F;FreeNAS_-_What_is_ZIL...</a>