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System Overview : Dell PowerVault 220S and 221S Systems Service Manual

Split-Bus Module

Your storage system supports three SCSI bus modes controlled by the split-bus module:

Joined-bus mode

Split-bus mode

Cluster mode

These modes are controlled by the position of the bus configuration switch when the system is turned on.

configuring the SCSI bus modes, see your Installation and Troubleshooting Guide.

Figure 6. Bus Configuration Switch Modes

The only difference between cluster mode and joined-bus mode is the SCSI ID assigned to the enclosure services processor on the EMM. When cluster mode is detected, the processor

SCSI ID changes from 6 to 15. As a result, SCSI ID 15 is disabled, leaving 13 available hard drives in cluster mode. This allows a second initiator, such as a host bus adapter or RAID

controller card on a second host server, to use SCSI ID 6 (see

Table 4. SCSI ID Assignments

Configuration

Joined-bus

Split-bus—primary EMM

Split-bus—secondary EMM

Cluster

NOTE:

The unshaded SCSI IDs are available for hard-drive use as indicated for each configuration. The reserved SCSI IDs are used as follows:

H = used by the host system initiator.

S = used by the storage system SES.

Figure 7. SCSI ID Numbers and Associated Hard Drives

file:///C|/Users/rishi_sood/Desktop/220s/en/sm/intro.htm[3/7/2013 12:09:13 PM]

1 joined-bus mode (top position for rack systems, right for tower systems)

2 split-bus mode (center position for rack and tower systems)

3 cluster mode (bottom position for rack systems, left for tower systems)

Table 4

for SCSI ID assignments and

Cables Used

Figure 6

illustrates the switch position for each mode. For more information on

Figure 7

for associated hard drives).

SCSI IDs Used