Selecting A Raid Level - Gateway ADAC Ultra2 S466 Hardware Manual

Selecting a RAID Level

Level Description and
Use
0 Data divided in
blocks and
distributed
sequentially (pure
striping). Use for
non-critical data
that requires high
performance.
1 Data duplicated on
another disk
(mirroring). Use
for read-intensive
fault-tolerant
systems
3 Disk striping with a
dedicated parity
drive. Use for non-
interactive apps
that process large
files sequentially.
5 Disk striping and
parity data across
all drives. Use for
high read volume
but low write
volume, such as
transaction
processing.
10 Data striping and
mirrored drives.
30 Disk striping with a
dedicated parity
drive.
50 Disk striping and
parity data across
all drives.
20 ADAC Ultra2 S466 Hardware Guide
Pros
High data No fault
throughput tolerance. All
for large data lost if
files any drive
fails.
100% data Doubles disk
redundancy space.
Reduced
performance
during
rebuilds.
Achieves Performance
data not as good as
redundancy RAID 1
at low cost
Achieves Performance
data not as good as
redundancy RAID 1
at low cost
High data More
transfers, complicated
complete
redundancy
High data More
transfers, complicated
redundancy
High data More
transfers, complicated
redundancy
Cons Max.
Drives
One to
32
2, 4, 6,
or 8
Three to
eight
Three to
eight
4, 6, or
8
Six to
32
Six to
32
Fault
Tolerant
No
Yes
Yes
Yes
Yes
Yes
Yes