Dell PowerVault 221S Handbuch - Seite 13

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Dell PowerVault 221S Handbuch
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
PAGE 13
• Table 2-17: Cluster Solution Vs RAID Levels
Concatenated
0
Not Recommended
• Table 2-1 2-7: RAID Level Benefit (Generalized)
Clustering Multi Channel
None
None
None
Excellent
Moderate
Excellent
Excellent
Excellent
Moderate
Moderate
Moderate
Moderate
RAID Level
1
10
5
Recommended
Capacity
Relative Cost
Excellent
None
Excellent
None
Excellent
Excellent
Moderate
Moderate
Moderate
Moderate
VER A02
50
Possible
Scalability
Excellent
None
None
None
None
Excellent
Moderate
Moderate
11/17/2005