1 and DIMM connector 4. However, the size, speed, type, and technology ofthe DIMMs that you install in DIMM connector 7 and DIMM connector 10 mustmatch each other.– The following table shows the DIMM upgrade configuration sequence foroperating in non-mirroring mode (normal mode).Table 6. 5. DIMM upgrade configuration sequence in non-mirroring modeNumber of DIMMs DIMM connectors2 1, 44 1, 4, 7, 106 1, 4, 7, 10, 2, 58 1, 4, 7, 10, 2, 5, 8, 1110 1, 4, 7, 10, 2, 5, 8, 11, 3, 612 1, 4, 7, 10, 2, 5, 8, 11, 3, 6, 9, 12v If a problem with a DIMM is detected, light path diagnostics lights thesystem-error LED on the front of the server, indicating that there is a problem,and guides you to the defective DIMM. When this occurs, first identify thedefective DIMM; then, remove and replace the DIMM.Removing and replacing memory modulesAt least one pair of DIMMs must be installed for the server to operate correctly.Installing memory modulesDIMMs must be installed in pairs of the same type and speed. To use the memorymirroring feature, all the DIMMs in the server must be the same type and speed,and the feature must be supported by your operating system. The followinginstructions are for installing one pair of memory modules.Installing a memory module: To install a memory module, complete the followingsteps:1. Read the safety information that begins on page vii and “Handlingstatic-sensitive devices” on page 57.2. Turn off the server and peripheral devices; then, disconnect the power cordsand all external cables necessary to replace the device.DIMMRetainingclip3. Remove the power supply or power supplies from the server.70 IBM System x3500 Type 7977: Problem Determination and Service Guide
