User's Manual

Understanding RAID Concepts 55
No-RAID
In Storage Management, a virtual disk of unknown metadata is considered a
No- RAID volume. Storage Management does not support this type of virtual
disks. These must either be deleted or the physical disk must be removed.
Storage Management allows Delete and Rename operation on No-RAID
volumes.
RAID 6 Excellent Sequential
reads: good.
Transaction
al reads:
Very good
Fair, unless
using write-
back cache
Poor N + 2
(N = at
least two
disks)
Critical
information.
Databases
and other
read-
intensive
transactional
uses.
RAID 60 Excellent Very Good Fair Poor X x (N +
2)
(N = at
least 2)
Critical
information.
Medium-
sized
transactional
or data-
intensive
uses.
Table 3-1. RAID Level and Concatenation Performance Comparison (continued)
RAID
Level
Data
Availability
Read
Performance
Write
Performance
Rebuild
Performance
Minimum
Disks
Required
Suggested
Uses
N = Number of physical disks
X = Number of RAID sets