HP StorageWorks XP48 - Disk Array, Owner'S Manual

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RAID TECHNOLOGY
RAID technology is used by your HP SureStore E Disk Array to utilize
your disk space efficiently and to keep your data safe in case a problem
occurs with one of your disk drives.
RAID technology combines low cost and high performance, while
providing you with high reliability. RAID technology separates your data
and your disk drives into disk arrays and disk volumes. These divisions are
used to safeguard data and to make the most efficient use of your disk drive
space.
Two RAID types are supported on the XP512 and XP48. Which RAID type
you need depends on the type of data storage solution you require.
In most situations, RAID0/1 will have better performance over RAID5. If
the host application is write-intensive, there should not be many, if any,
performance differences between either of the two RAID groups. If the host
application is more read-intensive, you will see some performance
differences between the two RAID groups.