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StorCase Technology Fibre-to-SCSI Single RAID User Manual

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S10C100 User's Guide - Rev. A01

StorCase Technology, Inc.

Appendix B - Array Basics

133

RAID

Level

Minimum #

of Drives

Description

Pros

Cons

RAID 5

3

Block-level data

striping with

distributed parity

Best cost and

performance for

transaction-

oriented networks

Very high

performance and

data protection

Supports multiple

simultaneous

read/writes

Can also be

optimized for

large, sequential

requests

Write performance is

slower than RAID 0 or

RAID 1

IFS_54

RAID 10

RAID 0/1

3

Combination of

RAID 0 (data

striping) and

RAID 1

(mirroring)

Highest

performance and

data protection

(can tolerate

multiple drive

failures)

High redundancy costs -

twice the storage

is capacity required

Volume

Sets

1

Non-RAID,

non-striped

mapping to a

single drive

(similar to

JBOD)

Ability to use a

single drive to

store additional

data

No data protection - if

drive fails, all data is

lost

Lower performance

(not striped)

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

capcaity than RAID 5

Table B-1: RAID Level Comparisons (cont'd)