HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 67

Product Description controller with 256 Mbytes of cache will use half of the memory to mirror the other controller, leaving only 128 Mbytes for its own cache. The write cache contents cannot be flushed when both controllers are removed from the disk array simultaneously. In this case the write cache image is lost and data integrity on the disk array is compromised. To avoid this problem, never remove both controllers from the disk array simultaneously. 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 LUN the capacity can be expanded. See "Adding Capacity to the Disk Array" on page 254 for more information on adding disks and other ways of increasing disk array capacity. Capacity Management Features 67