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Chapter 6
Removing and Replacing Components
System Memory DIMMs
187
System Memory DIMMs
System memory DIMMs are located on the memory extender board.
Replacing Deallocated Memory Ranks
This section provides the steps necessary to replace deallocated memory ranks.
NOTE When replacing deallocated memory ranks on a server with system firmware version 45.11 or
greater, you must perform the following procedure before replacing the deallocated memory.
This procedures is necessary to ensure that the memory is properly reallocated upon server
boot.
To ensure the repaired memory rank reallocates properly, follow these steps:
Step 1. Boot to BCH.
Step 2. Enter the in me command to view the deconfigured quad of memory.
Step 3. Enter the ser pdt clear command. The following message displays followed by a 30 second delay:
If DIMM replacement is necessary, power down the system now:
Use ^B MP:CM> PC -OFF -NC, then pull power cord and replace DIMM.
Otherwise, the system will automatically reboot in 30 seconds.
Step 4. You must remove power from the system within 30 seconds.
Step 5. See Removing Memory DIMMs Installing Memory DIMMs and for instructions on removing and
replacing the memory DIMM.
Removing Memory DIMMs
WARNING Ensure that the system is powered off and all power sources have been disconnected
from the server before removing or replacing system memory DIMMs.
Voltages are present at various locations within the server whenever an ac power
source is connected. This voltage is present even when the main power switch is in
the off position.
Failure to observe this warning can result in personal injury or damage to
equipment.
CAUTION Observe all ESD safety precautions before attempting this procedure. Failure to follow ESD
safety precautions can result in damage to the server.
To remove system memory, follow these steps:
Step 1. If rack-mounted, slide the server out from the rack until it stops. (See “Accessing a Rack-Mounted
Server” on page 177.)