Appendix D: Raid Level Reference Guide - HighPoint RocketRAID 4520 Series User Manual

Appendix D: RAID Level Reference Guide

Type Description
Just a bunch of
JBOD
disk
RAID Disk Striping
0
RAID
1 Disk Mirroring
Disk Mirroring
RAID
followed by
1/0
stripe
Disk Striping
RAID
with Rotating
5
parity
Disk Striping
RAID
with dual
6
rotating parity
Refer to the RAID controller product specifications for supported RAID levels.
1
Min. Usable Advantage
disks space
Each drive can be
accessed as a single
1 100%
volume
Offers the highest
performance
2 100%
Provides convenient low-
cost data redundancy for
2 50%
smaller systems and
servers
High read performance
and medium write
performance with data
4 50%
protection for up to 2-
drive failures
High read performance,
and medium write
3 67-94% performance with data
protection with a single
drive failure
High read performance,
and medium write
performance with data
4 50-88%
protection in case of up
to two drives failure
1
Disadvantage
No fault tolerance - failure
of one drive results in
complete data loss
No fault tolerance – failure
of one drive in the array
results in complete data
lose
Useable storage space is
50% of total available
capacity. Can handle 1 disk
failure.
Useable storage capacity
equals total capacity of all
drives in the array minus
two
Not recommended for
database applications that
require frequent/heavy
write sessions. Can handle
1 disk failure.
Not recommended for
applications that require
frequent/heavy write
sessions.
Application
Backup
Temporary file,
performance driven
application.
Operating system,
backup, and
transaction database.
Fast database and
application servers
which need
performance and
data protection
Data archives, and
ideal for application
that require data
protection
Data archives and
ideal for application
that requires data
protection
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