Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

Planning Storage 2–13
For this reason, you should avoid using a stripeset to store critical data. Stripesets
are more suitable for storing data that can be reproduced easily or whose loss does
not prevent the system from supporting its critical mission.
■ Evenly distribute the members across the device ports to balance load and provide
multiple paths.
■ Stripesets may contain between two and 24 members.
■ Stripesets are well-suited for the following applications:
❏ Storing program image libraries or run-time libraries for rapid loading.
❏ Storing large tables or other structures of read-only data for rapid application
access.
❏ Collecting data from external sources at very high data transfer rates.
■ Stripesets are not well-suited for the following applications:
❏ A storage solution for data that cannot be easily reproduced or for data that
must be available for system operation.
❏ Applications that make requests for small amounts of sequentially located data.
❏ Applications that make synchronous random requests for small amounts of
data.
Spread the member drives as evenly as possible across the two I/O device ports.
Mirrorset Planning Considerations
Mirrorsets (RAID 1) use redundancy to ensure availability, as illustrated in Figure 2–9.
For each primary disk drive, there is at least one mirror disk drive. Thus, if a primary disk
drive fails, it’s mirror drive immediately provides an exact copy of the data. Figure 2–10
shows a second example of a Mirrorset.