IBM System Storage DS5020 Installation, User's, And Maintenance Manual page 193

Table 22. Symptom-to-FRU index (continued)
Problem
indicator Component
Intermittent or Some or all
sporadic power CRUs
loss to the storage
subsystem
Possible cause Possible solutions
Defective ac power Check the ac power source.
source or Reseat all installed power cables
improperly and power supplies. If applicable,
connected power check the power components
cable (power units or universal power
supply). Replace defective power
cables.
Drives are part of Use the Subsystem Management
an exported array. window in the DS Storage
When the array is Manager to verify that the drives
exported, the power are indeed part of an exported
to the drives in the array. If they are, remove the
array is turned off drives from the storage
so that they can be subsystem as required.
removed from the Note: If the drives are removed,
enclosure. the empty drive slots must be
filled with other drives or blank
drive trays to ensure optimal air
flow.
Drives are Use the Subsystem Management
incompatible. Power window in the DS Storage
to incompatible Manager to verify that the drives
drives is turned off are recognized as incompatible.
when they are Replace the incompatible drives
inserted into the with drive options that are
drive slots. supported by the storage
subsystem controllers. See the
"Parts listing" on page 166 for a
list of compatible drives.
Drive failure Use the Subsystem Management
window in the DS Storage
Manager to verify that the drive
or drives are recognized as failed
by the storage subsystem.
Replace the failed drives. See
the "Parts listing" on page 166 for
a list of compatible drives.
Power supply failure Check the power supply Fault
LED on the power supply. If the
LED is lit, replace the failed CRU.
Midplane failure Have the midplane replaced.
Contact an IBM technical support
representative.
Chapter 6. Hardware maintenance
163