IBM 8669 Hardware Maintenance Manual - Page 58

SCSI drives, SCSI IDs

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v The server comes with one 3.5-inch, 1.44 MB diskette drive and one 48x IDE CD-ROM drive. v The empty bays below the diskette drive come without a device installed. You can use these bays for 5.25-inch, half-high, removable-media drives, such as tape backup drives. You also can combine these bays into a single, full-high bay and install a digital linear tape (DLT) drive; or, you can install an xSeries Media Bay Ultra 160 Hot Swap Conversion Kit option, which converts these bays to three hot-swap drive bays. v The xSeries 342 server supports only one diskette drive. v If you are installing a device with a 50-pin connector in either of the 5.25-inch bays, you need a 68-pin to 50-pin converter (option number 32G3925). v The server supports three slim-high (1-inch) hot-swap hard disk drives in the hot-swap bays. If the server has the xSeries Media Bay Ultra 160 Hot Swap Conversion Kit option installed, it supports three additional hot-swap hard disk drives. v The hot-swap bays connect to a SCSI backplane. This backplane is a printed circuit board behind the bay. Note: The server EMI integrity and cooling are both protected by having the 5.25-inch bays covered or occupied. When you install a drive, save the filler panel from the bay, in case you later remove the drive and do not replace it with another. 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 channel. Notes: 1. Any information about SCSI drives also applies to other SCSI devices, such as tape drives. 2. If you plan to install both internal and external SCSI devices, you must follow the instructions in "Connecting external options" on page 65, in addition to the instructions in this section. A 16-bit (wide) SCSI cable connects the SCSI hard-disk drive backplane to an integrated SCSI controller on the system board. An additional 16-bit 1-drop SCSI cable is shipped inside the server. It is folded and restrained with a cable clamp on the bottom of the server chassis near the empty bays. You can use this cable to connect an optional SCSI device installed in one of the empty 5.25-inch bays to the SCSI channel A connector on the system board. SCSI IDs Each SCSI device that is connected to an individual channel of a SCSI controller needs a unique identification (ID) so that the controller 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. The server automatically sets SCSI IDs for hot-swap hard disk drives. The SCSI ID assigned to each hot-swap bay is shown on the server beside the bay. The server uses the hard disk drive SCSI IDs to send status information to the indicator lights above each hot-swap bay. 48 Hardware Maintenance Manual: xSeries 342 Type 8669

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v
The server comes with one 3.5-inch, 1.44 MB diskette drive and one 48x IDE
CD-ROM drive.
v
The empty bays below the diskette drive come without a device installed. You
can use these bays for 5.25-inch, half-high, removable-media drives, such as
tape backup drives. You also can combine these bays into a single, full-high bay
and install a digital linear tape (DLT) drive; or, you can install an xSeries Media
Bay Ultra 160 Hot Swap Conversion Kit option, which converts these bays to
three hot-swap drive bays.
v
The xSeries 342 server supports only one diskette drive.
v
If you are installing a device with a 50-pin connector in either of the 5.25-inch
bays, you need a 68-pin to 50-pin converter (option number 32G3925).
v
The server supports three slim-high (1-inch) hot-swap hard disk drives in the
hot-swap bays. If the server has the xSeries Media Bay Ultra 160 Hot Swap
Conversion Kit option installed, it supports three additional hot-swap hard disk
drives.
v
The hot-swap bays connect to a SCSI
backplane
. This backplane is a printed
circuit board behind the bay.
Note:
The server EMI integrity and cooling are both protected by having the
5.25-inch bays covered or occupied. When you install a drive, save the filler
panel from the bay, in case you later remove the drive and do not replace it
with another.
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 channel.
Notes:
1.
Any information about SCSI drives also applies to other SCSI devices, such as
tape drives.
2.
If you plan to install both internal and external SCSI devices, you must follow
the instructions in “Connecting external options” on page 65, in addition to the
instructions in this section.
A 16-bit (wide) SCSI cable connects the SCSI hard-disk drive backplane to an
integrated SCSI controller on the system board. An additional 16-bit 1-drop SCSI
cable is shipped inside the server. It is folded and restrained with a cable clamp on
the bottom of the server chassis near the empty bays. You can use this cable to
connect an optional SCSI device installed in one of the empty 5.25-inch bays to the
SCSI channel A connector on the system board.
SCSI IDs
Each SCSI device that is connected to an individual channel of a SCSI controller
needs a unique identification (ID) so that the controller 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.
The server automatically sets SCSI IDs for hot-swap hard disk drives.
The SCSI ID assigned to each hot-swap bay is shown on the server beside the bay.
The server uses the hard disk drive SCSI IDs to send status information to the
indicator lights above each hot-swap bay.
48
Hardware Maintenance Manual: xSeries 342 Type 8669