About Raid; Levels Of Raid; Disk Spanning (None Raid) - Accusys ACS-8910 User Manual

• UPS support through a standard UPS interface

2. About RAID

2.1 Levels of RAID

RAID
Description
Level
None RAID Non-RAID
RAID 0 Disk Striping
Mirroring Plus
RAID 1
Striping
(0+1)
(if N>1)
Striping with
RAID 3 Parity on
dedicated disk
Striping with
RAID 5 Interspersed
parity
The ACS-8910 supports RAID Levels 0, 1, (0+1), (3) and 5. Depending on the application usage,
different RAID levels perform different functions and fault tolerance. The following is a brief
explanation of each RAID level. Be sure which RAID level is best suited for your application before
configuring the ACS-8910.

2.1.1 Disk Spanning (None RAID)

The capacity of all the drives is combined to become one logical drive (no block striping). In other
words, the capacity of the logical drive is the total capacity of the physical drives. NRAID does not
provide data redundancy.
Minimum Data
Drives Availability
1
N
= NRAID
>NRAID
N+1
= RAID 5
>NARID
N+1
= RAID 5
>NRAID
N+1
= RAID 5
None RAID
Minimum Disks required
Capacity
Redundancy
6
Performance Performance
Sequential Random
Drive Drive
R: Highest R: High
W: Highest W: Highest
R: High R: Medium
W: Medium W: Low
R: High R: Medium
W: Medium W: Low
R: High R: High
W: Medium W: Low
1
N
No