Adding different types of drives enables you to read other types of media, and provides more storage for your server.
Some drives have a special design called small computer system
interface, or "SCSI." This design allows you to attach multiple drives
to a single adapter or controller.
Inside your server there is a SCSI-2 adapter, which manages the
SCSI drives. This adapter has both an internal and external connector.
By chaining drives (connecting them together with cables), you can attach
additional external SCSI drives. Your server supports a total of
seven SCSI drives (internal and external).
Each SCSI device connected to the adapter needs a unique identification (ID) so the adapter can identify the devices. The adapter then can ensure that different devices do not attempt to transfer data at the same time. (Refer to the instructions that came with your SCSI device for information about setting a SCSI ID.)
When SCSI devices are chained, both ends of the chain require
a terminator. The purpose of these terminators is to ensure that the quality
of the signal is maintained throughout the SCSI chain. The internal SCSI
drive in bay C has a terminator activated, so any additional SCSI internal
devices do not need a terminator.
The external SCSI connector has a built-in terminator, which is
automatically enabled when nothing is attached to it. The external SCSI
connector is on the back of the server in slot 1. (Refer to the instructions
that came with the device for more information about terminators.)
Internal drives are installed in bays. The bays are referred
to as A, B, C, D, and E. Your server comes with a diskette drive
in bay A and a SCSI hard disk drive in bay C.
Drives come in a variety of heights. You can install half-high drives that are less than 41.3 mm (1.6 in.) high in any of the bays. Drives that are greater than 41.3 mm (1.6 in.) high (full-high) can be installed in bay C or bay D. Bays C and D can each hold two half-high drives or one full-high drive.
Different types of hardware (slides, rails, and trays) are used to install a drive in a bay. The type and size of the drive, as well as where it is to be installed, determine what hardware you will need when installing it.
Cover plates (sometimes called bezels) cover the front of each installed drive. If you install a drive that uses removable media (diskette, tape, optical disc, or CD), you will need to change the cover plate.
Both internal and external drives connect to your server with
cables. Your server has three types of internal drive cables:
If you attach external SCSI devices to your server, you should purchase the cables when you buy the devices. Your IBM Authorized Dealer or Marketing Representative can help you select the correct cables.
If you select Enable Fast External SCSI from the Change Configuration
menu, be aware of the following:
SCSI Cable Lengths
1. The Model 3510 SCSI Storage Enclosure holds one SCSI device.
2. The Model 3511 External Storage Enclosure for SCSI Devices can hold up to seven SCSI devices.
3. The Model 3532 is a 2.3GB external SCSI tape drive.
If you have installed the maximum number of SCSI devices your SCSI adapter supports, and you plan to install more SCSI drives, you can install another SCSI adapter. Then, you can connect the additional devices to the new adapter.
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