IBM EXP400 Type 1733, Руководство по техническому обслуживанию и ремонту

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Table 5. Troubleshooting information (continued)
Component Problem indicator Possible cause Possible solutions
One or more
drive CRUs
One or more green
LEDs are off
No activity to the
drives
No action is required.
All drive CRUs or
those on one bus
No activity to the
drives
No action is required.
Damaged or loose
SCSI cables
Check the SCSI-bus cables and connections.
ESM failure Use the system-management software to check the
SCSI-bus status. Replace the ESM. See “Replacing
an ESM” on page 27.
Midplane failure Replace the chassis assembly.
Front panel Power supply Make sure the cables are plugged in and power
supplies are turned on.
Hardware failure Run the diagnostic program on the server attached
to the expansion unit. Replace the failing device.
Some or all CRUs Intermittent or
sporadic power loss to
the expansion unit
Defective ac or dc
power source or
partially plugged
power cable
Check the ac or dc power source. Secure all
installed power cables and power supplies. If
applicable, check the power components (power
supply units, uninterruptible power supply, and so
on). Replace defective power cables.
Power supply
failure
Check for a fault LED on the power supply and
replace the failed CRU. See “Replacing a hot-swap
power supply with fan unit” on page 28.
Midplane failure Replace the chassis assembly.
Drives and SCSI
bus
Unable to access
drives on one or both
SCSI buses
Incorrect SCSI ID
settings
Make sure the SCSI cables are undamaged and
properly connected. Check the drive SCSI ID
settings. Be sure that configuration switches SW3
and SW4 (on the ESM) are set to the appropriate
positions.
Attention: Change configuration switch positions
only when your host server and expansion unit are
turned off.
ESM failure Replace the EMS. See “Replacing an ESM” on
page 27.
Bridge card Bridge card failure All high address or all low address hard disk drives
failed; check the bridge card CRU and replace if
necessary. See “Replacing a bridge card” on page
26.
Subsystem Random errors Midplane failure Replace the chassis assembly.
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IBM EXP400 Storage Expansion Unit Type 1733: Hardware Maintenance Manual and Troubleshooting Guide