User`s guide

A-10
Storage Concepts
Applications Suitable for Striped Sets
Compared to RAID arrays, striped sets are not well-suited for
online storage of important data. They can, however, be useful for
storing the following:
■ Program image libraries or run-time libraries
■ Large tables or read-only data structures
The above applications can be backed up on tape or on other
RAID arrays for security, while a copy on a striped array can
provide rapid application access.
■ Data collected from external sources at a very high transfer rate
This is best suited for situations where the data can be restored
or is reproducible by repeating the process which produced it.
■ Page files or swap files
Mirror Set (RAID 1)
A mirror set is an array made up of two equal-sized partitions that
reside on two different disk drives. A mirror set stores and
maintains the same (redundant) data on each of the two drives.
Since a mirror set is an independent access array, it supports
multiple simultaneous read and write operations.
Figure A-5 represents a mirror set. The free space of the larger disk
drive is not used.
Figure A-5 Mirror set
Free Space (2 GB)
Mirror Set A
4 GB
Drive A
4 GB
Drive A (Redundant)
4 GB
Blocks 1, 2, 3, ...