I don&#x27;t think the author of this post really understands ZFS.<p>Is that a 4 disk mirror? You&#x27;d be much faster using a raid10 there.<p>ZFS &#x27;cache&#x27; devices are&#x27;t for write cache either, you&#x27;d want a log device for write perf reasons if that&#x27;s your constraint...  Even then it&#x27;s unlikely to make a difference on a workstation workload with 16GB of memory..