HP ProLiant 1500 SMART-2DH Array Controller Reference Guide - Page 138

D-5 Drive Array Benefits Using drive arrays with the SMART-2DH Array Controller has several important benefits: s Data Protection s Performance Enhancement s Capacity Changes s Data Reliability Data Protection The SMART-2DH Controller provides several options to produce data redundancy for a more reliable system including distributing data, fault tolerance methods, assigning online spares, and rebuilding data. Fault Tolerance (RAID) Options During configuration, you will need to make RAID (Redundant Arrays of Inexpensive Disks) level choices. RAID is a term used for an array technology that provides data redundancy to increase system reliability and performance. There are several RAID levels ranging from RAID-5 to RAID-0. The SMART-2DH Controller provides the following levels of RAID: s RAID 5 - distributed data guarding s RAID 4 - data guarding s RAID 1 - drive mirroring s RAID 0 - no fault tolerance (data striping only) The fault tolerance method you choose affects the amount of available disk storage capacity and performance of your drive array. Table D-1 lists the supported RAID levels and illustrates how the fault tolerance method you select affects the performance and capacity. SMART-2DH Array Controller Reference Guide Writer: Pamela King Project: SMART-2DH Array Controller Reference Guide Comments: 295469-002 File Name: K-APPD.DOC Last Saved On: 2/27/98 12:06 PM COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED