Chapter 6. IBM System x3850 X5 and x3950 X5 299For more information and to download Electronic Service Agent, go to the following website:https://www-304.ibm.com/support/electronic/portal/navpage.wss?category=5&locale=en_US6.11.4 Recovery processThis section provides an overview of several recovery procedures. These procedures do notreplace the Problem Determination and Service Guide. You can solve many problems withoutoutside assistance by following the troubleshooting procedures in the Problem Determinationand Service Guide, which is available at the following website:http://ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5084848The Problem Determination and Service Guide describes the diagnostic tests that you canperform, troubleshooting procedures, and explanations of error messages and error codes.If you have completed the diagnostic procedure and the problem remains, and you haveverified that all code is at the latest level, and all hardware and software configurations arevalid, contact IBM or an approved warranty service provider for assistance.Two-node configuration does not power on after a failureThe following list provides useful tips for bringing a 2-node configuration back online after afailure: Check the IMM Event Log. Check the LEDs on the light path diagnostic panel. Make sure that the power cord is connected to a functioning power source. Make sure that the power cord is fully seated in the power supply. Check the power-supply LEDs. Check the QPI link LEDs. When the QPI link LEDs are lit, they indicate that the QPI linksare fully established. Remove all power cords from both nodes. Wait a few seconds and replug the cords in thefollowing order: Top PS 2, Bottom PS 1, Top PS 1, and Bottom PS 2. You will need to havepower to all nodes at relatively the same time to ensure that the IMMs can communicateacross the QPI cables. Remove the QPI cables to separately debug the servers. Before you remove the QPIcables, the power must be removed.One node fails in a 2-node configurationIn certain cases, resolving an issue in a 2-node configuration takes longer because it is adifficult task. When you need the system back online as quickly as possible, you can operatethe system as a single-node configuration. Use the following steps to configure the node thatis still working:1. Remove all power cords from the working node.2. Remove all QPI cables from the working node.3. If available, install the QPI wrap cards.4. If the working node is not fully populated with memory, add the memory of the secondnode. Remember the installation sequence for the memory.
