Hardware options installation 46
Advanced ECC population guidelines
For Advanced ECC mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines.
• DIMMs may be installed individually.
Online spare population
For Online Spare memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines.
• Each channel must have a valid online spare configuration.
• Each channel can have a different valid online spare configuration.
• Each populated channel must have a spare rank:
o A single dual-rank DIMM is not a valid configuration.
o LRDIMMs are treated as dual-rank DIMMs.
Lockstep Memory population guidelines
For Lockstep memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines.
• 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 L)
• RDIMM: Sequentially in alphabetical order (A through L)
• UDIMM: A through H, sequentially in alphabetical order. Do not populate DIMM slots I through L.
• HDIMM: All 12 DIMMs per processor must be populated.
After installing the DIMMs, use RBSU to configure Advanced ECC, online spare, or lockstep memory support.
Installing a DIMM
The server supports up to 24 DIMMs. To install a DIMM:
1. Power down the server (on page 20).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
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