Host Storage Status Alarm

Hello,
Weare usingthefollowingversions:
-VCenterServerversion5.5.0build1,750,787
-VSphereclientversion5.5.0build1,474,107
-ESXiversion5.5.0build1,623,387

Currently weare facingwiththe5hostssimultaneouslyappearon theHostStorageStatus critical alarm. WhencheckingtheHardwareStatustab from vSphere client alarm appears asfollows:

Disk1onHPSA1: BayPort0Box0: 0GB: UnconfiguredDisk: DiskError.
Sensorname:Disk2onHPSA1: BayPort0Box0: 0GB: UnconfiguredDisk: DiskError.

All the physical serversare C7000 HPBlades

Please guide us to check and fix this issue.
Thank you. /.