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40 Preparing Your Systems for Clustering
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These modes are controlled by the position of the bus configuration switch when the system is
turned on. Figure 3-2 illustrates the switch position for each mode.
Figure 3-1. Back-Panel Module Features and Indicators
The only difference between cluster mode and joined-bus mode is the SCSI ID occupied by the
enclosure services processor. When cluster mode is detected, the processor SCSI ID changes
from 6 to 15, allowing a second initiator to occupy SCSI ID 6. As a result, SCSI ID 15 is
disabled, leaving 13 available hard drives in cluster mode. For more information about SCSI ID
assignments and cluster mode operation, see your Dell PowerVault 220S and 221S Systems
Installation and Troubleshooting Guide. See Table 3-3 for a description of the split-bus module
modes and functions.
NOTE: To change the SCSI bus mode, you must change the position of the bus configuration switch
before turning on the storage system. Using the bus configuration switch while the system is on does not
affect system operation. If you change the bus configuration switch while the system is running, the
change will not take effect until you perform the following sequence: shut down the nodes, reboot the
storage system, and then turn on the nodes.
split-bus
module
power LED indicator
fault LED indicator
active LED indicator
power LED indicator
fault LED indicator
active LED indicator
bus configuration switch
power LED indicator
secondary
EMM
primary
EMM
se500wbk1.book Page 40 Thursday, June 16, 2005 4:19 PM