Compaq ProLiant Clusters HA/F100 Administrator's Manual page 66

2-32 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide
In the "Cluster Groups" section of this chapter, you created a resource
dependency tree, then transferred that information into a Cluster Group
Definition Worksheet (Figure 2-8). Under the resource dependencies in the
worksheet, you listed at least one physical disk resource. For each physical
disk resource, determine the capacity and level of protection required for the
data to be stored on it.
For example, the Web Sales Order Database group depends on a log file, data
files, and program files. It might be important for the log file and program files
to have a quick recovery time, while performance would be a secondary
concern. Together, the files do not take up much capacity; therefore, mirroring
(RAID 1) would be an efficient use of disk space and would fulfill the
recovery and performance characteristics. The data files, however, would need
excellent performance and excellent protection. The data files are expected to
be large; therefore, a mirrored configuration would require an unacceptably
expensive number of disk drives. To minimize the amount of physical capacity
and still meet the performance and protection requirements, the data files
would be configured to use Distributed Data Guarding (RAID 5).