3.2 How to Install a Memory Module

Memory modules for this system are dual inline memory modules (DIMMs). Each DIMM bank must contain four DIMMs of equal density (for example, four 64-Mbyte DIMMs) to function properly. Supported DIMM configuration options are 32, 64, and 128 megabytes. See the Sun Enterprise 220R Server Owner's Guide for more information about memory.

3.2.1 Configuration Rules

The following memory configuration rules apply to your system:

• At least one memory bank (all four bank slots) must be filled for the system to boot.

• DIMMs must be added four at a time within the same bank.

• DIMM capacities can differ from one bank to the next--for example, four 64-Mbyte DIMMs installed in bank 0 and four 128-Mbyte DIMMs installed in bank 2 is permissible.

Refer to the following diagram for memory locations in your system.

3.2.2 Before You Begin

Complete these tasks:

• "2.1 How to Power Off the System"

• "2.4 How to Position the System for Service"

• "2.6 How to Remove the System Cover"

• "2.8 How to Avoid Electrostatic Discharge"

DIMMs are made of electronic components that are extremely sensitive to static electricity. Static electricity from your clothes or work environment can destroy the DIMM. Always wear a grounding strap when you handle the modules.

Do not remove a DIMM from its antistatic packaging until you are ready to install it. Handle the modules only by their edges. Do not touch the components or any metal parts. Always wear a grounding strap when you handle the modules.

3.2.3 What to Do

1. Remove the new memory module from its antistatic packaging.

2. Locate the socket into which you will install the module.

3. Position the module so that the small notch on the bottom corner of the module is at the same end as the socket's ejection lever.

   

4. Align the module with its socket until it contacts the socket evenly along the socket's length.

5. Press firmly down on both corners of the module until the bottom edge is firmly seated in the socket.

   You will hear a clicking sound when the module is fully seated.

6. Repeat Steps 3 through 5 for each module you want to install.

3.2.4 What Next

Complete this task to reassemble the system:

• "2.7 How to Replace the System Cover"

When you are ready to restart the system, be sure to run OpenBoot Diagnostics tests to verify that the system functions correctly with the new parts you have just installed. For additional information, see:

• "7.6 How to Use OpenBoot Diagnostics (OBDiag)"