Infortrend
2-4
Table 2 - 1 RAID Levels
RAID Level Description Capacity Data Availability
NRAID Non-RAID N N/A
RAID 0 Disk Striping N ==NRAID
RAID 1 (0+1) Mirroring Plus Striping (if N>1) N/2 >>NRAID
==RAID 5
RAID 3 Striping with Parity on
dedicated disk
N-1 >>NRAID
==RAID 5
RAID 5 Striping with interspersed
parity
N-1 >>NRAID
==RAID 5
Logical
Volume
Striping one or more logical
drives of different RAID levels
* Higher; depends
on its members
RAID Level Performance Sequential Performance Random
NRAID Drive Drive
RAID 0 R: Highest
W: Highest
R: High
W: Highest
RAID 1 (0+1) R: High
W: Medium
R: Medium
W: Low
RAID 3 R: High
W: Medium
R: Medium
W: Low
RAID 5 R: High
W: Medium
R: High
W: Low
Logical Volume Depends on its members;
see above
Depends on its members
8. Any spare drives?
(Swap Drive Rebuild / Spare Drive Rebuild)
Spare drives allow for the unattended rebuilding of a failed
drive, heightening the degree of fault tolerance. If there is no
spare drive, data rebuild has to be manually initiated by
replacing a failed drive with a healthy one.
As is often ignored, a spare drive (whether dedicated or global)
must have a capacity no smaller than the members of a logical
drive.
9. Limitations?
Firmware 3.31 and above support 64-bit LBA. A maximum of
64TB capacity can be included in single logical drive.
Up to 128 members can be included in each logical drive.
Extreme array sizes can cause operational problems with
system backup and should be avoided.
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