Dell PowerVault 220S Manual

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Dell PowerVault 220S Manual Manual pdf 22 page image

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS VER A02PAGE 22 11/17/2005a failover condition, access rights to the disk array assigned to the failed node istransferred to the other node. An active/active cluster node must be sized appropriately tohandle the load of both nodes (in the event of a failover).The term active/passive refers to failover cluster configurations in which one or morecluster nodes is actively processing requests for cluster applications while at least onecluster node simply waits for an active node to fail. An active/passive configuration is morecostly in terms of price/performance because one or more servers sits idle most of thetime. It is appropriate for business-critical systems since the application can use the fullpower of another server in case of a failure.Dell PowerEdge Clustered systems fully support both cluster topologies with MSCS.Figure 4-4 Cluster Topology Cabling ExamplePV22xS – Common Features and CapabilitiesRegardless of what topology is ultimately selected, the PV22xS provides a basic set ofcommon features and capabilities.SCSI ID AssignmentSCSI standard requires that all devices on the SCSI bus have a unique address, called aSCSI ID, with a maximum of 16 devices that can reside on the bus. The SCSI ID for theenclosure devices are hardwired by the enclosure backplane. PV22xS supports 15 ofthese devices with the SCSI controller in the host system using the remaining SCSI ID. InCluster topology, however, the enclosure will give up one of its HDD SCSI ID, which will