Chaparral K5312/K7313 ユーザーズマニュアル

RAID 3

3

Block-level data 
striping with 
dedicated parity 
drive

Excellent 
performance for 
large, sequential 
data requests

Not well-suited for 
transaction-
oriented network 
applications; single 
parity drive does 
not support 
multiple, 
concurrent and 
write requests

RAID 4 
(Not 
widely 
used)

3 Block-level 

data 

striping with 
dedicated parity 
drive

Data striping 
supports multiple 
simultaneous read 
requests

Write requests 
suffer from same 
single parity-drive 
bottleneck as 
RAID 3; RAID 5 
offers equal data 
protection and 
better performance 
at same cost

RAID 5

3

Block-level data 
striping with 
distributed parity

Best 
cost/performance 
for transaction-
oriented networks; 
very high 
performance and 
data protection; 
supports multiple 
simultaneous reads 
and writes; can also 
be optimized for 
large, sequential 
requests

Write performance 
is slower than 
RAID 0 or RAID 1

RAID 50

6

Combination of 
RAID 0 (data 
striping) and 
RAID 5 with 
distributed parity

Better random 
performance and 
data protection 
than RAID 5

Lower storage 
capacity than 
RAID 5

Table A-1. Comparing RAID Levels (Continued)