v Before you run diagnostic programs, you must determine whether the failingserver is part of a shared hard disk drive cluster (two or more servers sharingexternal storage devices). If it is part of a cluster, you can run all diagnosticprograms except the ones that test the storage unit (that is, a hard disk drive inthe storage unit) or the storage adapter that is attached to the storage unit. Thefailing server might be part of a cluster if any of the following conditions is true:– You have identified the failing server as part of a cluster (two or more serverssharing external storage devices).– One or more external storage units are attached to the failing server and atleast one of the attached storage units is also attached to another server orunidentifiable device.– One or more servers are located near the failing server.Important: If the server is part of a shared hard disk drive cluster, run one testat a time. Do not run any suite of tests, such as “quick” or “normal” tests,because this might enable the hard disk drive diagnostic tests.v If the server is halted and a POST error code is displayed, see Appendix C,“UEFI/POST error codes,” on page 473. If the server is halted and no errormessage is displayed, see “Troubleshooting by symptom” on page 190 and“Solving undetermined problems” on page 208.v For information about power-supply problems, see “Solving power problems”on page 206 and “Power-supply LEDs” on page 179.v For intermittent problems, check the event log; see “Event logs” on page 181 andAppendix B, “DSA diagnostic test results,” on page 335.Performing the checkout procedureThis information provides the procedures for determining the cause of the serverproblems.About this taskTo perform the checkout procedure, complete the following steps:Procedure1. Is the server part of a cluster?v No: Go to step 2.v Yes: Shut down all failing servers that are related to the cluster. Go to step 2.2. Complete the following steps:a. Check the power supply LEDs (see “Power-supply LEDs” on page 179).b. Turn off the server and all external devices.c. Check all internal and external devices for compatibility athttp://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.d. Check all cables and power cords.e. Set all display controls to the middle positions.f. Turn on all external devices.g. Turn on the server. If the server does not start, see “Troubleshooting bysymptom” on page 190.h. Check the system-error LED on the operator information panel. If it is lit,check the light path diagnostics LEDs (see “Light path diagnostics” on page170).i. Check for the following results:Chapter 4. Troubleshooting 167
