Software Support

Comparing RAID Level And Concatenation 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.

NOTE: The following table does not show all supported RAID levels in Storage Management. For information on all

supported RAID levels in Storage Management, see Choosing RAID Levels And Concatenation.

Table 1. RAID Level and Concatenation Performance Comparison

RAID Level Data

Availability

Read

Performance

Write

Performance

Rebuild

Performance

Minimum Disks

Required

Suggested

Uses

Concatenation No gain No gain No gain N/A 1 or 2

depending on

the controller

More cost

efficient than

redundant

RAID levels.

Use for

noncritical

data.

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.

Fair, unless

using

Fair N + 1 (N = at

least two disks)

Databases and