HP StorageWorks 1000 HP StorageWorks 1000 Modular Smart Array reference guide - Page 19

MSA1000 Hardware Components 1 2 345 7 6 \ Controller Display 1 2 3 4 5 6 7 Description Fault indicator (amber) Display Left push button Up push button Right push button Down push button Redundancy Link indicator (green) For more information about the MSA1000 Controller display, see the HP StorageWorks 1000 Modular Smart Array Maintenance and Service Guide. Array Accelerator (Battery-backed Cache) The Array Accelerator is a high-performance, upgradeable 256-MB SDRAM DIMM read/write battery-backed cache that can increase performance in database and fault-tolerant configurations. It performs both protected posted-write caching and read-ahead caching, allowing data to be accessed much faster than from disk storage. In protected posted-write caching, data is written to the cache memory on the Array Accelerator rather than directly to the drives. Later, when the MSA1000 storage system is idle, the controller writes the cached data to the drive array. HP StorageWorks 1000 Modular Smart Array Reference Guide 19