HP LH4r HP Netserver LH Pro NetRAID Installation Guide - Page 44

APPENDIX C RAID Array Configuration The following two examples illustrate the RAID array configuration process for HP NetServer Clusters: • Setting up RAID 1 arrays on an HP NetServer cluster • Setting up RAID 5 arrays on an HP NetServer cluster After you have finished defining and configuring the cluster's arrays using HP NetRAID Assistant, you will need to return to Part 5 and finish array configuration using the Windows NT Disk Administrator utility. Setting Up RAID 1 Arrays on an HP NetServer Cluster The HP NetRAID adapter and proprietary HP NetRAID software can be used to organize the cluster's disk storage into RAID level 1 disk arrays. Each level 1 RAID array is composed of two hard (hot swap) drives located in external shared storage cabinets. RAID level 1 (mirroring) provides storage redundancy with maximum performance. A RAID 1 array consists of two drives that contain exactly the same data. That is, all of the data on one drive is replicated (mirrored) on the other. Raid Level 1 Data Distribution Stripe Drive 1 Drive 2 1 Block 1 Block 1 2 Block 2 Block 2 3 Block 3 Block 3 The preceding table shows how data is distributed for RAID 1. Since each drive contains a complete copy of all data, all data is still available after the failure of one drive. To rebuild the RAID array after a failure, the failed drive is replaced and the data simply copied from the good drive to the new drive. HP NetServer LH Pro Microsoft Cluster Installation Guide - 1 October 1997 35