All platforms & versions of Data ONTAP
- High CPU utilization seen on a storage controller in
sysstat -x 1and
sysstat -M 1.
- A large percentage of blocks read into readahead are directory blocks ((ra.dir_blocks / ra.requested) * 100) in
ra.dir_blocks = 68624833
ra.requested = 92736262
(In this case, ~74% of all blocks in readahead during the sample period were directory blocks).
Note: The above two symptoms are not a *definitive* indication that your CPU utilization is caused by directory work; however, it could be.