Hardware options installation 62
Online spare population guidelines
For Online Spare memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 61).
• 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. A single dual-rank DIMM is not a valid configuration.
Mirrored Memory population guidelines
For Mirrored Memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 61).
• Always install DIMMs in channels 1 and 2 for each installed processor.
• Do not install DIMMs in channel 3 for any processor.
• DIMMs installed on channel 1 and channel 2 of an installed processor must be identical.
• In multi-processor configurations, each processor must have a valid Mirrored Memory configuration.
• In multi-processor configurations, each processor may have a different valid Mirrored Memory
configuration.
Lockstep Memory population guidelines
For Lockstep memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 61).
• 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.
• When high performance heatsinks are installed on the server, do not install DIMMs in channel 2 or
channel 4.
Installing a DIMM
1. Power down the server (on page 17).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
3. Do one of the following:
o Extend the server from the rack (on page 17).
o Remove the server from the rack (on page 19).
4. Remove the access panel (on page 20).
5. Remove the expansion board.
6. Open the DIMM slot latches.
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