Users Guide

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 34. RAID level performance comparison

RAID Level Data Availability 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