Wednesday, 28 December 2016

NetApp controller CPU high and disk util low

You can use sysstat -x 1 command to list the system performance.
If there is high CPU utilization but low disk utilization, then it is an indicator that internal processes are consuming resources.

First place to look at is WAFL scan. "priv set diag;wafl scan status".

If there are multiple scans running then "wafl scan speed" and the following two diag flags can be modified to reduce the CPU utilization.
setflag wafl_blk_reclaim_secs_max xxx
setflag wafl_blk_reclaim_secs_min yyy

 

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