Hardware options installation 60
• 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 might have a different valid Lockstep Memory
configuration.
Optical drive cage option
1. Do one of the following:
o For tower models, open and remove the bezel ("Remove the tower bezel" on page 21).
o For rack models, if installed, remove the security bezel (on page 21).
2. Power down the server (on page 20).
3. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
4. For tower models, do the following:
a. Place the server on a flat, level surface with the access panel facing up.
b. Remove the access panel (on page 23).
5. For rack models, do the following:
a. Extend the server from the rack (on page 24).
b. Remove the access panel (on page 23).
c. Release thumbscrews and remove the rack bezel.
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