Hello guys,
We have a FAS2040 hosting VMware luns and Exchange luns using ISCSI. The environment is rather small and performance is nice overall. However, we've noticed that everyday, the both CPUs of the second controller peak at about 90-95%. This results in a drop of overall IOP/s and affects all the LUNs. This occurs precisely between 13:00 and 13:10. Not before, not after.
No specific jobs are supposed to be running at that time either on the Netapp side, Exchange side or VMware side (including servers). I don't see any tasks that would do this other than one on the NetApp controller.
I've attached some diagnostics command in priv set diag.
sysstat -x 2
sysstat -M 1
and so on.
I've determined that the Kahuna domain was taking about 70-80% of the CPU between 13:00 and 13:10. It normally takes about 10-15%. Now, I don't know where to look to determine what is running behind the Kahuna process.
Your help in pinpointing where is the issue or the task running would be greatly appreciated.
Thanks.