I have a cluster with 2 FAS8060, they are NOT AFF model, with 6 2246 fully populated with 800GB SSD. I want to ADP them and need your opinion. Would it be better to go with RAID group of 28 + 28 + 16 or 25 + 25 + 22? Is there any limitation I'm hitting? I think I saw an article somewhere that AFF model supports only upto 36 drives and I was wondering if FAS8060 is the same case.
Even on AFF, ADP is limited to 2 shelves, with additional shelves being used as standard unpartitioned drives. It is ok to mix these two sizes of SSDs inside an aggregate (ie, 800GB for a standard drive and ~760GB on an ADP drive, or 380GB on an ADPv2 drive)
Our design rule is to put no more than 4 x 24 drive SSD shelves on a single SAS stack. For this 8060, that would mean running 2 x 3 shelf stacks from the 4 onboard SAS ports, or adding an additional SAS card to split workload. The FAS8060 supports up to 240 SSDs - this would require an additional SAS card per controller (X2065 or X2069), and running 2 x 4 shelf stacks + 1 x 2 shelf stack
Our design rules for RAID groups under ONTAP 9 state that if any of the RAID groups are different sizes, the smallest group should be at least half the size of the largest group, so 28+28+16 is acceptable, however it doesn't stasify our 1+1% per controller per disk type spare policy, so it would become 28+28+14 - marginal, but still ok, but the neat-freak in me would prefer 24+23+23