On XOS 9.5.x and later, the customer may experience periodic minor CPU utilization peaks on a CPM/APM with disks in a RAID configuration.The following can be observed in the logs (including the timing, i.e. starting every Sunday at 4:22 am):
To explain this behavior.
The higher CPU utilization is caused by a higher disk activity due to a scheduled Cron job checking the health of the RAID. It is run weekly on Sunday at 4:22 am (as per /etc/crontab). Its purpose is to ensure the consistency of the RAID and is recommended to be left enabled. Higher CPU/disk activity during the RAID check will have only a minimal impact on the overall performance of the box.
In a case where the customer explicitly wishes to have this RAID health check turned off, the file /etc/sysconfig/raid-check on the relevant CPM/APM needs to be edited as follows:
Locate the following line:
And change it to:
This change will take effect immediately after saving the file.