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Indications of a failed DIMM are:
• A post error on boot.
• An error in the Lenovo XClarity Controller interface.
• Not all memory is detected. For example, the appliance should have 256 GB per node and the host only
shows 240 GB
Remove a DIMM
Use this information to remove a memory module.
"Read the
installation
Guidelines" on
page 47
Attention: Memory modules are sensitive to static discharge and require special handling. In addition to the
standard guidelines for Handling static-sensitive devices:
• Always wear an electrostatic-discharge strap when removing or installing memory modules. Electrostatic-
discharge gloves can also be used.
• Never hold two or more memory modules together so that they touch. Do not stack memory modules
directly on top of each other during storage.
• Never touch the gold memory module connector contacts or allow these contacts to touch the outside of
the memory-module connector housing.
• Handle memory modules with care: never bend, twist, or drop a memory module.
Before you remove a DIMM:
1. Identify the failed DIMM by either checking the event logs in UEFI setup or use the Lenovo XClarity
Controller web console to browse the post event log. The event log contains information about the
location of the DIMM fault.
2. Place the node in maintenance mode by following the procedure
Storage and Availability Technical Documents Repository
3. Power off the node and if the cable management arm is not in place, disconnect all the cables.
4. Remove the compute node from the enclosure (see
5. Remove the compute node cover (see
6. Remove the air baffle (see
Complete the following steps to remove a DIMM.
"Power off
the compute
node
for this task"
on page 32
Remove the compute node cover
).
Remove the air baffle
Ground package before opening"
Enter Maintenance Mode
.
Remove a compute node from the chassis
).
.
Chapter 8
Hardware replacement procedures
"ATTENTION:
Static Sensitive Device
on page 49
in the
VMware
).
73
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