Dell PowerVault 220S Manual - Page 13

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1. Powervault™ 220S & 221S Storage Enclosure

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS

Additional configuration factors

Hot Spares

Hot Spare functionality provides extra security availability and redundancy by replacing a

failed drive, allowing the rebuild of the degraded array to begin immediately. Both the

Adaptec and LSI based PERC controllers' support this feature, but a simple SCSI

controller would not. See the controller user's guide for details and limitations. Use of Hot

Spares is recommended whenever possible.

Clustering Considerations

In a cluster environment the cache being disabled on the controller poses a significant

performance impact to RAID 5 and RAID 50 configurations. If the system is to be clustered

RAID 10 is the optimal RAID level.

Cluster

Solutions

Considerations for Optimal RAID Performance

The PowerVault™ 22xS is capable of offering increased performance by allowing multiple

channels to connect to the storage enclosure. This ability can increase the performance

of most configurations by allowing a multi channel RAID controller to increase the

bandwidth of the SCSI bus. For more information see Table 4-2: PV22xS Configuration

Topologies vs RAID Level Performance.

Concatenated drives

RAID 0

RAID 1

RAID 10

RAID 5

RAID 50

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• Table 2-17: Cluster Solution Vs RAID Levels

Concatenated

Not Recommended

• Table 2-1 2-7: RAID Level Benefit (Generalized)

Clustering Multi Channel

None

Excellent

Moderate

Excellent

Moderate

RAID Level

Recommended

Capacity

Relative Cost

Excellent

None

Excellent

None

Excellent

Moderate

VER A02

Possible

Scalability

Excellent

None

Excellent

Moderate

11/17/2005