&gt; The more RAM you give ZFS the better performance you get (to a point) but I believe this issue is massively over talked about and hyped.<p>Definitely not hyped as you said in the enterprise space - think some home users see that warning of 1GB per 1TB though and get put off.<p>In my experience we were running multiple vSphere NFS volumes on several large 16x bay FreeNAS systems. We started with 16x 1TB disks and 16GB of RAM. It wasn&#x27;t until we installed 32GB of RAM before performance became acceptable. Ideally we should really have put in 64GB of RAM but alas Intel&#x27;s damn Ivy Bridge E3 range maxed out at 32GB.<p>I should stress we were only running 20 virtual machines in total so nothing massively onerous, but that extra RAM made all the difference.