When using VERITAS VxFS, random CPU spikes near 100% when performing multiple I/O intensive operation such as batch processing and online db2 backups etc.
Random CPU spikes to near 100% and possible long I/O wait times.
This problem is caused by VERITAS Direct I/O driver performance Etrack 2293722 incident.
DB2 V9.7 or V9.5 using VERITAS VxFS
Diagnosing the problem
Check the fstab.out file in the db2support output to determine if VxFS is being used. Check if the fix for VERITAS Direct I/O driver performance incident 2293722 is installed.
Resolving the problem
Contact Symantec(VERITAS) for the fix for Etrack 2293722, Direct I/O driver performance incident.