[OpenIndiana-discuss] Raid type selection for large # of ssds

Grant Albitz GAlbitz at Albitz.Biz
Fri Oct 5 16:39:06 UTC 2012

I feel bad asking this question because I generally know what raid type to pick.

I am about to configure 24 256gig ssd drives in a ZFS/Comstar deployment. This will serve as the datastore for a vmware deployment. Does anyone know what raid level would be best. I know the workload will determine alot, but obviously there is varying workload across a vmware environment. Since we are talking about ssds I dont see a particular reason to not create 1 big zfs pool, with the exception that I know people generally try to keep the drive count from getting out of control. Raid 10 seems like a waste of space with little benefit in performance in this case. i am leaning towards raid z2 but wanted to get everyones input.

The datastore will host a fileserver, and exchange server for about 50 users. The environment is all 10g and they have solid states in all desktops so essentially that is the reason for such a large SSD deployment for a small # of users.

There seems to be varying opinions, especially when you factor in trying to keep writes low for ssds.

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