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Problem indicator
Component
Amber LED on and
Power supply
green ac power LED
CRU
off
Green LED on
Drive CRU
ID=6
One or more green
One or two
LEDs off
drive CRUs
All drive CRUs
or those on
one bus
Front panel
Intermittent or
Some or all
sporadic power loss
CRUs
to the storage unit
Unable to access
Drives and
drives on one or
SCSI bus
both SCSI buses
Bridge card
Random errors
Subsystem
Note: If you cannot find the problem in the troubleshooting chart, test the entire
32
IBM TotalStorage IP Storage 200i Storage Unit Installation and User's Guide
Possible cause
Possible solutions
No ac power to
If ac power is good at the source, replace the power cord
power supply.
CRU. If the power supply has failed, replace the power
Check the ac
supply CRU. See"Removing a hot-swap power supply/fan
power cord
unit" on page 29.
(cable) or breaker
Cluster
If not currently cluster configured, power cycle the storage
configuration
unit to re-enable ID=6.
No activity to the
No action is required.
drives
No activity to the
No action is required.
drives
Damaged or
Check SCSI-bus cables and connections.
loose SCSI
cables
ESM board
Use RAID management software to check the SCSI-bus
failure
status. Replace the ESM board. See"Replacing an ESM
board" on page 27.
Midplane failure
Have the storage unit serviced.
Power supply
Make sure the cables are plugged in and power supplies
are turned on.
Hardware failure
If any other LEDs are turned on, have the storage unit
serviced.
Defective ac
Check the ac power source. Resecure all installed power
power source or
cables and power supplies. If applicable, check the power
partially plugged
components (power units, UPS, and so on). Replace
power cable
defective power cables.
Power supply
Check for a fault LED on the power supply and replace the
failure
failed CRU. See"Installing a hot-swap power supply/fan
unit" on page 29.
Midplane failure
Have the storage unit serviced.
Incorrect SCSI ID
Make sure SCSI cables are undamaged and properly
settings
connected. Check the drive SCSI ID settings. Ensure that
option switches 1 and 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
Bridge card
All high address or all low address hard-disk drive failed;
failure
check the bridge card CRU and replace if necessary. See
"Replacing a bridge card" on page 25.
Midplane failure
Have the storage unit serviced.
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.
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