Hi,    Usually proactive Hotspare (copying to Hotspare) happened when the drive is nearly failing.,  This need an investigation to check why proactive hotspare is happening..., I would request you to generate SP collects and open a chat with CLARiiON team to review the SP collects.   Regards, Suman Pinnamaneni.
Why is my disk copying off to the hot spare if there are no indications of a drive failure?  Should I have the disk replaced that its copying off from? 
CX4 Disk Copying off to hot spare