How to check which volume(s) on an aggregate are busy

[pbowen]

Hi Folks,

We have a 4Tb FAS250 with 2 aggregates using Ontap 7.2.6.1. How do we check which volumes are buisiest.

If this is tricky, please will you give an exampe 1st with the command(s) for a single aggregate filer.

Thanks,

Paul.

[anthonyfeigl]

Paul,

try this command:

stats show volume:*:read_latency

I will refer you to this excellent article.

http://communities.netapp.com/groups/chris-kranz-hardware-pro/blog/2009/04/01/performance-stats-without-perfstat-or-ops-mgr

Anthony feigl

[pbowen]

Thanks Anthony,

This is great stuff

Regards,

Paul.

[amiller_1]

Although....if you do have Ops Mgr, Performance Advisor is the dead-simplest way to look at volume busi-ness.

[chriskranz]

Thanks for the plug Anthony, I owe you a beer

Another stat to check would be "total_ops" of the volume...

stats show volume:*:total_ops

If a system isn't very busy, then there may be no latency at all, so total_ops would give you how many operations (read, write and other) are happening per second during that period. However you might expect to see some traffic over volumes that aren't being used due to the filer doing some background processes. Anything above 5 operations / second is probably being used by something external to the filer.

If you are looking to cover your back before deleting a volume, always offline it and leave it for a short period (maybe a few days) so you can be sure that the volume isn't going to be missed!