Hardware options installation 34
Lockstep Memory population guidelines
For Lockstep memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 33).
• DIMM configuration on all channels of a processor must be identical.
• In multi-processor configurations, each processor must have a valid Lockstep Memory configuration.
• In multi-processor configurations, each processor may have a different valid Lockstep Memory
configuration.
Population order
For memory configurations with a single processor or multiple processors, populate the DIMM slots in the
following order:
• LRDIMM: Sequentially in alphabetical order (A through H)
• RDIMM: Sequentially in alphabetical order (A through H)
• UDIMM: A through D, sequentially in alphabetical order. Do not populate DIMM slots E through H.
After installing the DIMMs, use RBSU to configure Advanced ECC, online spare, or lockstep memory support.
Installing a DIMM
CAUTION: To avoid damage to the hard drives, memory, and other system components, the air
baffle, drive blanks, and access panel must be installed when the server is powered up.
1. Power down the server.
2. Remove the server blade (on page 13).
3. Remove the access panel (on page 14).
4. Remove all DIMM baffles ("Remove the DIMM baffle" on page 14).
5. Locate the DIMM tool ("DIMM tool location" on page 10) and remove it from the DIMM baffle.
6. Use the DIMM tool to open the DIMM slot.
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