IBM eServer xSeries 235 Type 8671, Maintenance & Troubleshooting

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Note: If you plan to attach external SCSI devices, you must order additional
SCSI cables. To select and order the correct cables for use with
external devices, contact your IBM reseller or IBM marketing
representative.
15. If you have other options to install or remove, do so now; otherwise, go to
“Installing the server bezel and left-side cover (tower model)” on page 96 or
“Installing the server bezel and top cover (rack configuration)” on page 99.
Working with the 3-Pack Ultra320 Hot-Swap Expansion option
Your server contains hardware that enables you to replace a failed hard disk drive
without turning off the server. Therefore, you have the advantage of continuing to
operate your system while a hard disk drive is removed or installed. These drives
are known as
hot-swap drives. The hot-swap drives are attached to a hot-swap
hard disk drive backplane . The backplane is a printed circuit board behind the drive
bays. For more information about drive bays and drive installation, see “Installing
internal drives” on page 71. The low voltage differential (LVD) SCSI hot-swap hard
disk drive backplane supports a maximum of six slim-high, hot-swap hard disk
drives.
If you install the 3-Pack Ultra320 Hot-Swap Expansion option, you can attach up to
three additional drives. All of these drives must be LVD hard disk drives that
operate at 320 MB per second or lower. The optional 3-Pack Ultra320 Hot-Swap
Expansion Kit contains a hot-swap hard disk drive backplane that you install
adjacent to the standard hot-swap hard disk drive backplane. It also includes the
SCSI cable you need to install the option. Your server supports a maximum of two
hot-swap drive backplanes.
Note: All drives being used in the server should have the same throughput speed
rating: mixing speed ratings might cause all drives to operate at the lower
throughput speed.
Do the following to configure the channels on the two SCSI backplanes:
v
You can configure each SCSI channel (bus) independently. This is the typical
backplane configuration. In this configuration:
– The hard disk drives that are connected to the standard backplane are
attached to channel A.
– The hard disk drives that are connected to the 3-Pack Ultra320 Hot-Swap
Expansion option backplane are attached to channel B.
Notes:
1. The standard LVD SCSI backplane is also known as the SCSI backplane or the
hot-swap hard disk drive backplane.
2. The SCSI backplane that comes with the 3-Pack Ultra320 Hot-Swap Expansion
Kit is also known as the 3-Pack backplane.
3. Table 8 on page 107 lists the SCSI identifiers (IDs) for the standard LVD SCSI
backplane and hard disk drives. Table 9 on page 107 lists the SCSI IDs for the
3-Pack backplane and hard disk drives.
4. Cable identifiers are printed on the cables that come with your server and
options. Use these identifiers to connect the cables to the correct connectors.
For example, the hard disk drive cables are labeled “HDD option.”
5. For information about other options and using the 3-Pack Ultra320 Hot-Swap
Expansion option, see the documentation that comes with the option kit.
Chapter 4. Customer replaceable units
67