IBM QS22 - BladeCenter - 0793, Service Manual

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Adding or changing I/O buffer DDR2 memory modules
This section describes how to add I/O buffer memory. For instructions on how to
add system memory see “Adding or changing system memory” on page 39.
Each IBM PowerXCell 8i companion chip has one DIMM slot for I/O buffer memory.
The QS22 blade server supports VLP DDR2 1 GB DIMMs. You must add memory
as a pair of DIMMs, one for each IBM PowerXCell 8i companion chip.
To install I/O buffer memory, complete the following steps:
1. Read the safety information beginning on page vii and “Installation guidelines”
on page 29.
2. If applicable, shut down the operating system, turn off the blade server, and
remove the blade server from the BladeCenter unit. See “Removing the blade
server from the BladeCenter unit” on page 30.
3. Open the blade server cover. See “Opening and removing the blade server
cover” on page 31.
4. Locate the DIMM slots for the I/O buffer DDR2 memory modules.
There are two DIMM slots, one for each IBM PowerXCell 8i companion chip.
The slots are labelled
IOBUF 1
and
IOBUF 2
. You must install a 1 GB DIMM for
both IBM PowerXCell 8i companion chips.
5. Remove the DIMM fillers from the slots. Retain the DIMM fillers. They are an
important part of the blade server cooling system and you need them if you ever
remove the I/O buffer DIMMs from the blade server.
6. If applicable, remove any modules that are to be replaced or that have become
redundant.
a. Open the retaining clips on either end of the DIMM slot. This lifts the DIMM
and disengages it from the slot.
b. Pull the DIMM out of the slot.
7. Place each DIMM in its slot, contact side down. Check the orientation of the
modules. The locating pin in each slot must match the corresponding cut-out on
the module.
8. Carefully press the modules into place until the retaining clips snap into place.
Make sure that the clips are locked properly.
Figure 16. I/O buffer DIMM slot location
Chapter 4. Installing and removing replaceable units
41