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High System Ops in root volume every hour.

Ontap Version 8.1.3P1

Root aggr is 2 disk raid4 aggr with root vol on 7k Sata.

Every hour the root vol iops spike to 20k - 22k and I have no idea why. During this time the root vol latency stays low, however there is a performance impact on the other data aggr on the system.

I have used dfm to view the spikes and see that the ops are all sys_ops.

There is no SIS running and this filer is the snapmirror destination for only one volume.

The filer is used to serve cifs and nfs data only.

Reallocation scan are on for 4 volumes in the data aggr:

Schedule: n/a

Interval: 1 day

Optimization: 1

There are no other scheduled jobs on this filer that I know of.

Could the reallocation be the cause for the huge spike in iops? Has any one seen anything like this before?

Re: High System Ops in root volume every hour.

High System Ops in root volume every hour.

I verified that there is only one hostname in the snmp.access list. The interval of the spike does seem to point to some sort of system query such as from snmp or perhaps the dfm server that is monitoring it.

Re: High System Ops in root volume every hour.

You could try setting the IP address in snmp.access and see if that does not help perhaps open a case.

High System Ops in root volume every hour.

I will try changing to ip address to see if that resolves some of the iops. I will also open a case for this one as well. Thanks for the help.