Some great notes on designing an AFF:
- Don't mix any other disk type with an AFF (hence, all flash) in the HA Pair. Feel free to mix within the cluster though!
- Don't use Flash Cache with AFF
- It's perfectly OK to put the root aggregate on SAS drives.
- Flash disks have the same MTBF as SAS disks, and expected life of 5 years.
And of course, some performance data:
Documents: TR-4289, "All Flash FAS Technical FAQ"
