Any way to view which specific disks a volume is using? (Reallocation-related)

HUX20002000 — Tue, 07 Jan 2025 00:43:12 GMT

I've inherited a FAS2720 system and I have a volume that's showing poor performance. I'm wondering if disks were added to its aggregate but a reallocation job was never run. Is there a way to see the current allocation status of a volume, i.e. which specific disks its data is stored on?

Related: is there a way to analyze a volume/aggregate to see if reallocating volume data would be beneficial?

Re: Any way to view which specific disks a volume is using? (Reallocation-related)

HUX20002000 — Tue, 07 Jan 2025 01:11:45 GMT

Naturally, I found the answer right after posting this thread!

volume reallocation measure -vserver [SVM] -path [volume path] -once true

That produces a job ID, which you can monitor with:

job show -id [job ID] -fields starttime,endtime,state,progress

When the job completes, the result is shown in System Manager -> Events. Filter the 'Event' column on 'wafl.reallocate.check'. A result of 1 is optimal. Higher numbers are bad. The event will advise if reallocation would be worthwhile.

Example: "wafl.reallocate.check.highAdvise: Allocation check on '/vol/mail_archive' is 13, hotspot 0 (threshold 4), consider running reallocate"

topic Any way to view which specific disks a volume is using? (Reallocation-related) in ONTAP Discussions

Any way to view which specific disks a volume is using? (Reallocation-related)

Re: Any way to view which specific disks a volume is using? (Reallocation-related)