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Set SCSI Adapter DIP Switches
DIP switches on the SCSI adapter are used to set the SCSI address of the adapter.
These switches are preset at the factory at address 7 and should not need to be changed
unless there are multiple SCSI initiators on the same SCSI bus. This situation would
only occur in a multi-host environment, that is, if you are using the ServiceGuard
product.
If you need to set the DIP switches, the location of the switches on the SCSI adapter is
shown in figure 2. Component locations are the same for the HP A2969A and
HP A3644A SCSI adapters. The only physical difference in the two adapters is in the
type of front faceplate (also called bulkhead). The table on page 18 shows the SCSI
addresses for the various switch settings. For bus arbitration the order of priority with
the highest priority first is: 7,6,5,4,3,2,1,0, 15, 14, 13, 12, 11, 10,9,8.
Note
The SCSI adapter is factory set to SCSI bus address ‘7’ and should not
be changed unless it is used in a multi-initiator system.
If there are two adapters on the same SCSI bus, one should be set to
‘7’ and the other to ‘6’.
Address ‘7’ is the highest priority address on the SCSI bus followed by
‘6’. If the SCSI host adapter doesn’t have the highest priority,
performance wdl degrade or the SCSI bus may hang.
16 Installation Rocedures