| RAID Level: |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
10 |
53 |
0+1 |
RAID 5: Independent Data disks with distributed parity blocks  Each entire data block is written
on a data disk; parity for blocks in the same rank is generated on Writes,
recorded in a distributed location and checked on Reads. RAID Level 5 requires a minimum of 3 drives to implement |
Characteristics/Advantages Highest Read data transaction
rate Medium Write data transaction rate Low ratio of ECC (Parity) disks to data disks means high efficiency Good aggregate transfer rate |
Disadvantages Disk failure has a medium impact
on throughput Most complex controller design Difficult to rebuild in the event of a disk failure (as compared to
RAID level 1) Individual block data transfer rate same as single disk |