Dell PowerVault 220S Handmatig - Pagina 27
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A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS
RAID Levels
RAID 0
RAID 1
RAID 5
RAID 10
RAID 50
It can be observed that selection of a PV22xS configuration topology impacts not only
Application Attributes but also impacts RAID level performance. Besides these
configuration topologies, PV22xS provides some common capabilities as listed below for
the storage solution:
Redundancy Capabilities
•
Physical SCSI Data Path Redundancy
PV22xS using two Enclosure Management Modules (EMM) provides redundant
data path when configured in Cluster topology.
•
Management Redundancy
With multiple EMMs in PV22xS, hardware redundancy is provided when servicing
enclosure management requests
•
Power Supply Redundancy
PV22xS is capable of running on single power supply; multiple power supplies
provide 1+1 redundancy
•
Cooling Redundancy
PV22xS provides support of up to 2 fan units; each fan unit has 2 blowers in all
making 4 fan blowers. The unit is thermally designed to continue operating with 1
of 4 fan blower failure, thus giving a 3+1 cooling redundancy
Reliability Capabilities
•
Thermal Reliability
PAGE 27
• Table 4-2: PV22xS Configuration Topologies Vs RAID Level Performance
PV22xS Configuration Topologies
Joined
Best performance, if
Default RAID 0
configured across multiple
performance
channels
Increased Availability, if
Default
mirror set is on separate
channel
Default
Higher performance than
Default
RAID 1 with same increased
availability
Increase availability, if
Default
spanned across separate
channels
Split
Similar to Joined
topology
Default
VER A02
Cluster
Default
Default
Default
Default
11/17/2005