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RAID 5:
RAID 5 stripes both data and parity information across three or more drives. It writes
data and parity blocks across all the drives in the array. Fault tolerance is maintained by
ensuring that the parity information for any given block of data is placed on a different
drive from those used to store the data itself.
Features and Benefits
Drives:
Minimum 3.
Uses:
RAID 5 is recommended for transaction processing and general
purpose service.
Benefits:
An ideal combination of good performance, good fault tolerance,
and high capacity and storage efficiency.
Drawbacks:
Individual block data transfer rate same as a single disk. Write
performance can be CPU intensive.
Fault Tolerance:
Yes.
Disk 1
DATA 3
PARITY
DATA 7
DATA 1
DATA 9
PARITY
Disk 2
PARITY
DATA 5
DATA 8
DATA 2
PARITY
DATA 11
Disk 3
DATA 4
DATA 6
PARITY
PARITY
DATA 10
DATA 12
