Users Guide

Table Of Contents
RAID 10 characteristics:
Groups n disks as one large virtual disk with a capacity of (n/2) disks, where n is an even integer.
Mirror images of the data are striped across sets of physical disks. This level provides redundancy through mirroring.
When a disk fails, the virtual disk still works. The data is read from the surviving mirrored disk.
Improved read performance and write performance.
Redundancy for protection of data.
Comparing RAID level performance
The following table compares the performance characteristics associated with the more common RAID levels. This table
provides general guidelines for choosing a RAID level. Evaluate your specific environment requirements before choosing a RAID
level.
Table 50. RAID level performance comparison
RAID Level Data
Redundancy
Read
Performance
Write
Performance
Rebuild
Performance
Minimum Disks
Required
Suggested
Uses
RAID 0 None Very Good Very Good N/A N Noncritical data.
RAID 1 Excellent Very Good Good Good 2N (N = 1) Small
databases,
database logs,
and critical
information.
RAID 5 Good Sequential
reads: good.
Transactional
reads: Very
good
Fair, unless
using writeback
cache
Fair N + 1 (N = at
least two disks)
Databases and
other read
intensive
transactional
uses.
RAID 10 Excellent Very Good Fair Good 2N x X Data intensive
environments
(large records).
228 Managing storage devices