This integer is the lockup code the array controller reported the last time it locked up prior to its most recent reset, and it is nonzero only when such an event has a code to report. An admin uses a nonzero value here as forensic evidence when investigating an unexpected controller reset or crash. For example, after an unplanned server reboot, the admin checks cpqDaCntlrLastLockupCode to see whether the array controller itself locked up and, if so, provides that code to vendor support.