HP Netserver LH Pro NetRAID Installation Guide

HP NetServer LH Pro Microsoft Cluster Installation Guide - 1 October 1997 35
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.