Hi Sunil,
It will be great if you have Support.
High CPU utilisation mostly is due to host load / other process load. I suggest you make sure you have good enough free space in your Aggrs, all the disk spindles are serving IOPs evenly.
Additionally, make sure you don't want to run processes like Dedupe / SnapMirror all volumes you don't require.
Any idea what is the total IOPs serviced from the FAS3250 system ?
Regards,
Bakshana