Hi All,
I've cabled up the second external shelf for our AFF-A220 and it sees the disks. Now I'm at a fork in the road.
We currently have two local data tiers made up of 24 disks each, one on each node.
Best practices at https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-psm... say a disk group of SSDs should be from 20-28 SSDs each.
If I go to create a new local tier the default is to create two new tiers, one on each node. That would give me two disks groups of 12, below the best practice. How badly would performance suffer? Any other caveats? Reliability?
I could put them all on one disk group, and on one node? Bleah.
I could add half of them to each existing tier/disk group and exceed the best practice by eight SSDs. I believe I've seen discussions (get it?) claiming that top limit is flexible with SSDs, was it here? But when I add another shelf I'll have the same problem.
Seems like the clearest path forward for consistency and future expansions is to add two tiers with small disk groups. So, can anyone guess if I'll have a significant performance impact? Any other caveats?
Grateful for any guidance,
Randy in Seattle