HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 64

In the event of an unexpected disk array shutdown or loss of power, the BBU provides power to cache memory to maintain the cache for 120 hours (5 days). Dynamic Capacity Expansion If slots are available in the disk enclosures, you can increase the capacity of the disk array without disrupting operation. By simply adding new disks to the array and then creating a new volume group, the capacity can be expanded. See "Adding Capacity to the Disk Array" on page 200 for more information on adding disks and other ways of increasing disk array capacity. 64 Capacity Management Features