IBM TotalStorage 200 Installation And User Manual page 40

Problem Component Possible
indicator
Amber LED on Power
and green ac supply CRU
power LED off
Green LED on Drive CRU
ID=6
One or more One or two
green LEDs off drive CRUs
All drive
CRUs or
those on
one bus
Front panel
Intermittent or Some or all
sporadic power CRUs
loss to the
storage unit
Unable to Drives and
access drives SCSI bus
on one or both
SCSI buses
Bridge card Bridge card
Random errors Subsystem
Note: If you cannot find the problem in the troubleshooting chart, test the entire
30
5194 Network Attached Storage Model EXU Installation and User's Guide
Possible solutions
cause
No ac power If ac power is good at the source, replace the power cord CRU. If
to power the power supply has failed, replace the power supply CRU. See
supply. Check "Removing a hot-swap power supply/fan unit" on page 26.
the ac power
cord (cable)
or breaker
Cluster If not currently cluster configured, power cycle the storage unit to
configuration re-enable ID=6.
No activity to No action is required.
the drives
No activity to No action is required.
the drives
Damaged or Check SCSI-bus cables and connections.
loose SCSI
cables
ESM board Use RAID management software to check the SCSI-bus status.
failure Replace the ESM board. See "Replacing an ESM board" on page 25.
Midplane Have the storage unit serviced.
failure
Power supply Make sure the cables are plugged in and power supplies are turned
on.
Hardware If any other LEDs are turned on, have the storage unit serviced.
failure
Defective ac Check the ac power source. Resecure all installed power cables and
power source power supplies. If applicable, check the power components (power
or partially units, UPS, and so on). Replace defective power cables.
plugged
power cable
Power supply Check for a fault LED on the power supply and replace the failed
failure CRU. See "Installing a hot-swap power supply/fan unit" on page 27.
Midplane Have the storage unit serviced.
failure
Incorrect Make sure SCSI cables are undamaged and properly connected.
SCSI ID Check the drive SCSI ID settings. Ensure that option switches 1 and
settings 3 (inside the switch card) are set to the appropriate positions.
Attention:
Change switch positions only when your host server and storage unit
is turned off.
ESM board Have the storage unit serviced.
failure
All high address or all low address hard-disk drive failed; check the
failure bridge card CRU and replace if necessary. See "Replacing a bridge
card" on page 23.
Midplane Have the storage unit serviced.
failure
system. See your User's Reference and Service Guide for more detailed
information on testing and diagnostic tools.