Raid Level 5 - easyRAID F8P U3TT User Manual

RAID level 5 arrays have unique performance characteristics :
The data can be recalculated or regenerated, using parity,
when any drive in the array fails.
When the failed drive is replaced, either automatically if the
subsystem contained a hot spare drive, or by user intervention
during a scheduled maintenance period, the system will be
restored its full data redundancy configuration by rebuilding
all of the data that had been stored on the failed drive onto
the new drive. This is accomplished using parity information
and data from the other data disks. Once the rebuild process
is complete, all data is again protected from loss due to any
failure of a single disk drive.
1-9 9
Introduction