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)