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> 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. Definitely not hyped

by leonroy 11y ago

> 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. 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. 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't until we installed 32GB of RAM before performance became acceptable. Ideally we should really have put in 64GB of RAM but alas Intel's damn Ivy Bridge E3 range maxed out at 32GB. I should stress we were only running 20 virtual machines in total so nothing massively onerous, but that extra RAM made all the difference.

the_ancient 11y ago
>We started with 16x 1TB disks and 16GB of RAM. Type of Drives, did you have a L2 ARC and ZIL... There are alot of reasons why you may have needed the additional ram. If you were using off the Shelf 7200 (or worse 5400) NAS drives then I am not shocked, these drives are for storage not for VM's. need atleast 10K drives for VM storage >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. It still kinda is, but 90% of the questions I see posted in various places are about Home and Test Labs, not Enterprise Deployments. you do not need 32GB of RAM for your home file server that is likely serving less than 10 clients.