Lenovo ThinkSystem SR635, Maintenance Manual

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5. Check the POST error log:
• If a DIMM was disabled by a systems-management interrupt (SMI), replace the DIMM.
• If a DIMM was disabled by the user or by POST, reseat the DIMM; then, run the Setup utility and
enable the DIMM.
6. Reseat the DIMM.
7. Restart the server.
Multiple rows of DIMMs in a branch identified as failing
1. Reseat the DIMMs; then, restart the server.
2. Remove the lowest-numbered DIMM pair of those that are identified and replace it with an identical
known good DIMM; then, restart the server. Repeat as necessary. If the failures continue after all
identified DIMMs are replaced, go to step 4.
3. Return the removed DIMMs, one at a time, to their original connectors, restarting the server after each
DIMM, until a DIMM fails. Replace each failing DIMM with an identical known good DIMM, restarting the
server after each DIMM replacement. Repeat step 3 until you have tested all removed DIMMs.
4. Replace the lowest-numbered DIMM of those identified; then, restart the server. Repeat as necessary.
5. Reverse the DIMMs between the channels (of the same processor), and then restart the server. If the
problem is related to a DIMM, replace the failing DIMM.
6. (Trained technician only) Replace the system board.
Hard disk drive problems
Use this information to resolve issues related to the hard disk drives.
• “Server cannot recognize a hard disk drive” on page 211
• “Multiple hard disk drives fail” on page 212
• “Multiple hard disk drives are offline” on page 212
• “A replacement hard disk drive does not rebuild” on page 212
• “Green hard disk drive activity LED does not represent actual state of associated drive” on page 212
• “Yellow hard disk drive status LED does not represent actual state of associated drive” on page 213
Server cannot recognize a hard disk drive
Complete the following steps until the problem is solved.
1. Observe the associated yellow hard disk drive status LED. If the LED is lit, it indicates a drive fault.
2. If the LED is lit, remove the drive from the bay, wait 45 seconds, and reinsert the drive, making sure that
the drive assembly connects to the hard disk drive backplane.
3. Observe the associated green hard disk drive activity LED and the yellow status LED:
• If the green activity LED is flashing and the yellow status LED is not lit, the drive is recognized by the
controller and is working correctly. Run the diagnostics tests for the hard disk drives. When you start
a server and press F11, the Lenovo XClarity Provisioning Manager Lite V2 interface is displayed by
default. You can perform hard disk drive diagnostics from this interface. From the Diagnostic page,
click
Run Diagnostic
➙
HDD test
.
• If the green activity LED is flashing and the yellow status LED is flashing slowly, the drive is
recognized by the controller and is rebuilding.
• If neither LED is lit or flashing, check the hard disk drive backplane.
Chapter 4
.
Problem determination
211