ONTAP Discussions

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

pbowen
5,872 Views

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.

4 REPLIES 4

anthonyfeigl
5,873 Views

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
5,873 Views

Thanks Anthony,

This is great stuff

Regards,

Paul.

amiller_1
5,873 Views

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

chriskranz
5,873 Views

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!

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