User`s guide

Installing Optional Disk and Tape Drives
7-4
Boot Device
• The SCSI host adapter with the lowest BIOS address is identified
by the server as the “primary” SCSI host adapter. When loading
the operating system from a SCSI SBB, this primary or boot drive
must be connected to the primary SCSI host adapter.
• To improve server performance, you might want to distribute the
SCSI devices across the SCSI host adapters.
• Each operating system has different limitations regarding the
number of SCSI host adapters that are supported. Refer to your
operating system documentation for additional information.
External Channel
• Make sure that the SCSI ID you select for the external SCSI
devices do not conflict with other devices installed in the server on
the same bus.
• Make sure that the external SCSI bus is terminated properly.
• For proper operation, the length of the SCSI cable for each
channel must not exceed 1 meter (3.28 ft)*. This includes the
length of the internal cable plus the length of the external cable to
the bulkhead.
• You will need to disable termination on the host adapter if it is in
the middle of the daisy chained SCSI cable. If you remove the host
adapter termination, make sure both ends of the SCSI cable are
properly terminated.
* According to Digital specifications