Using Serviceguard Extension for RAC, 3rd Edition, May 2006

Maintenance and Troubleshooting
Replacing Disks
Chapter 4 199
NOTE You cannot use inline terminators with internal FW/SCSI buses on D
and K series systems, and you cannot use the inline terminator with
single-ended SCSI buses. You must not use an inline terminator to
connect a node to a Y cable.
Figure 4-1 shows a three-node cluster with two F/W SCSI buses. The
solid line and the dotted line represent different buses, both of which
have inline terminators attached to nodes 1 and 3. Y cables are also
shown attached to node 2.
Figure 4-1 F/W SCSI Buses with In-line Terminators
The use of in-line SCSI terminators allows you to do hardware
maintenance on a given node by temporarily moving its packages to
another node and then halting the original node while its hardware is
serviced. Following the replacement, the packages can be moved back to
the original node.