HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 92

Concepts and Management Disk Array Features Shutdown The disk array uses a coordinated process called Shutdown to take the disk array offline. The primary function of Shutdown is to copy the contents of the controller NVRAM to the disks. This protects critical data stored in the NVRAM against loss should battery backup for the NVRAM fail in the absence of ac power. In the Shutdown state, the disk array can still execute some SCSI commands from the host, but the host cannot access any of the data on the disk array. Shutdown is performed automatically when the disk array is turned off using the power switch on the enclosure. The action of the power switch delays shutting off power long enough for the array controller to copy the NVRAM contents to each disk. NOTE! If power to the disk array is lost by means other than turning off the switch, the array will not have time to perform a successful Shutdown. In this case, the battery can sustain the NVRAM contents for a minimum of one week. Shutdown can be initiated manually using the disk array control panel or using a host software utility. However, a Shutdown makes all data on the disk array unavailable to the host. 92 Concepts