δεν ειμαι κ τοσο σιγουρος για το raid 5
http://www.bolthole.com/uuala/RAID.html
Comparison of RAID Levels
| Level | Advantages | Disadvantages
|
|---|
|
RAID 0
| Fastest I/O No overhead for parity Simple design,
easily implemented
| Not really RAID One drive failure destroys all data
Not for mission-critical deployment
|
|
RAID 1
| All drives usable for data reads
Can be implemented w/ 2 drives
| Greatest storage overhead - 100%
Highest cost/capacity ratio
|
|
RAID 3
| High transfer rates Degraded mode still fast
| Requires spindle synchronization
Can't do overlapped I/O
|
|
RAID 4
| High read transfer rates Efficient use of capacity
| Poor write rates Parity drive can be bottleneck
|
|
RAID 5
| Very high read rate Efficient use of capacity
| Slower write rates Slow rebuild times
|
|
RAID 6
| Allows failure of multiple drives
| Very poor write performance
Proprietary solution, rare
|
|
RAID 7
| Supposed to be fastest
| Proprietary, very expensive
|
|
RAID 1+0
| Very high reads and writes
| Most expensive
|