We have several NetApp products and I stuck in a FAS8040 disk busy issue. Here is the thing,
On our NetApp 2240 Product (ONTAP 8.2), I can see the disk busy graph very clearly with NetApp Management Console 3.3.5 as you can see below. (View -> Physical -> Related Aggregate -> Metrics )
Disk Busy Line Chart On Management Console
Yes, this is very useful for me and I want to see the same chart for our other NetApp FAS8040 ONTAP Release 9.1 & OnCommand Unified Manager 9.5.
Is there any way to see this Disk Busy graph on FAS8040 ONTAP 9.1 or OCUM 9.5 ?
Also how can I know my 512GB Flash Cache on FAS8040 is enough for me? Is 512GB Flash Cache is enough or should i increase to 1TB Flash Cache?. I want to know how much of these 512 gb Flash Cache drive is being used. Any help would be great.
I too miss the NMC graphs that just showed the "top" objects. We'd even use that disk-busy graph to see if we had a disk in a pre-fail condition (since one disk would usually go off the rails when that happened). Anyway, you can use the statistics command in ONTAP to gather some of that:
cluster-name::*> statistics disk show -node cluster-name-07
It's not as user friendly as the NMC graphs were, but it's a start.
On the FlashCache/PAM question, I'm going to have to dig a bit. Predictive Cache Statistics (PCS) gets a little weird on a system that already has a FlashCache card installed. That said, I used to peruse my top volumes on an aggregate and see what their cache hit ratio was per this page on the doc site: