Was your question answered correctly? If so, please remember to mark your question Answered when you get the correct answer and award points to the person providing the answer. This helps others searching for a similar issue.  If a disk fails in a non-raid protected group or the disk is a hot spare, no replacement takes place - this is by design.  glen
because if it misses a hot spare in a CLARiiON CX4-240, get the message: Description Spare request failed because the drive belongs to a non-redundant RAID group?
Spare request failed because the drive belongs to a non-redundant RAID group