IBM EXP15, Installation And User Handbook

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Troubleshooting Charts
Table 4. Expansion Unit Troubleshooting Chart
Problem Indicator Component Possible Cause Possible Solutions
Unable to access
drives on one or
both SCSI buses Drives and SCSI bus Incorrect SCSI ID
settings Make sure SCSI cables are undamaged and
properly connected. Check the drive SCSI ID
settings. If drives are daisy chained to the
same SCSI bus, Option switches 1 and 2 must
be set to different SCSI ID settings.
ESM board failure Have the ESM board replaced (service
technician only).
SCSI bus Cable too long If the external SCSI controller is SE (check
LEDs), make sure the cable length is
appropriate.
Random errors Subsystem Midplane failure Have the midplane replaced (service
technician only).
Note: If you cannot find the problem in the troubleshooting charts, test the entire system. See your
server documentation for more detailed information on testing and diagnostic tools.
If you already have run the server test program, or if running the test does not reveal the
problem, have the system serviced. (See Chapter 6, “Getting Help, Service, and Information”
on page 63.)
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IBM Netfinity EXP15 Installation and User's Handbook