Installing Internal Drives
A SCSI ID jumper (J12) is located on the rear of each backplane.
When you daisy-chain two backplanes in a disk-array model,
you must set the jumpers on these backplanes as described in
“Setting Backplane SCSI ID Jumpers (J12)” on page 252.
If the drive you are installing in a hot-swap tray has jumpers
(for example, ID jumper), remove the jumper pin block from the
drive.
SCSI Drives
Some drives have a special design called small computer system
interface or SCSI. This design allows you to attach multiple drives to
a single SCSI-2 adapter.
Note: Any information about SCSI drives also applies to other SCSI
devices, such as scanners and printers.
The server comes with a SCSI-2 adapter. The number of
preinstalled SCSI hard disk drives varies according to model. If you
install additional SCSI devices, each SCSI device that is connected to
the adapter needs a unique identification (ID) so that the SCSI-2
adapter can identify the devices and ensure that different devices do
not attempt to transfer data at the same time. If you need to set IDs
for SCSI devices, refer to the instructions that come with those
devices.
Your server automatically sets SCSI IDs for hot-swap drives. These
IDs are determined by the drive locations in the bays. The SCSI ID
for the preinstalled CD-ROM drive in bay A is set to 6, and the SCSI
ID for the SCSI-2 adapter is set to 7. The processing sequence for
SCSI devices is set according to their IDs.
The SCSI-2 adapter has both internal and external ports. Depending
on your server configuration, you can attach additional SCSI drives
by chaining them (connecting them together with cables).
Depending on the type of SCSI-2 adapter installed in your server,
the adapter supports a total of 15 or 45 SCSI drives (internal and
external). Refer to the User's Reference for more information.
Chapter 5. Installing Options 201
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