Dell PowerVault 221S Optimizing Dell SCSI Solutions - Page 27

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02 • Table 4-2: PV22xS Configuration Topologies Vs RAID Level Performance RAID Levels RAID 0 RAID 1 RAID 5 RAID 10 RAID 50 Joined Default RAID 0 performance Default Default Default Default PV22xS Configuration Topologies Split Cluster Best performance, if configured across multiple channels Increased Availability, if mirror set is on separate channel Similar to Joined topology Default Default Default Higher performance than RAID 1 with same increased availability Increase availability, if spanned across separate channels Default Default 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 11/17/2005