Dell PowerVault 221S (SCSI) - Manual (Page 13)

Connecting and Operating Your Storage System: Dell PowerVault 220S and 221S Systems Installation and Troubleshooting Guide
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Cabling Your System for Joined-Bus, Split-Bus, or Cluster Mode
How you cable your storage system to your host system(s) depends on the bus configuration you choose: joined-bus, split-
bus, or cluster.
A joined-bus configuration is one in which two SCSI buses are joined to form one contiguous bus.
A split-bus configuration enables you to connect your storage system to either one server with a multichannel RAID
controller, or to two servers. However, if one server fails, information controlled by that server is inaccessible.
A cluster configuration offers multiple paths to the system, which provides high data availability.
Figure 2-3 , Figure 2-4 and Figure 2-5 illustrate the cabling configuration and split-bus switch position for each SCSI bus
mode.
Figure 2-3. Joined-Bus Configuration
NOTE: In the joined-bus configuration, only one cable is required to connect the primary EMM or the secondary EMM to
the RAID controller or HBA. Do not connect both EMMs to host system at the same time.
NOTE: If you are using a multichannel host-based RAID controller or HBA, you can connect a separate, joined-bus
storage system to each channel of a single host system.
Figure 2-4. Split-Bus Configuration (One Server)