IBM TotalStorage DS4300 Installation, User's, And Maintenance Manual page 179

Table 17. Storage subsystem troubleshooting (continued)
Problem
indicator Component
Unable to access Drives and
drives expansion loop
Random errors Subsystem
Possible cause Possible solutions
Fibre-channel Ensure that the fibre-channel
cabling has cables are undamaged and
failed. properly connected.
Incorrect DS4300 Check the IBM DS4000 System
controller Storage product support Web site
firmware installed for the latest version of controller
to support a firmware and storage expansion
particular enclosure ESM firmware. Update
DS4000 storage the firmware to the latest version
expansion if required.
enclosure model.
For example,
EXP810s require
controller
firmware version
6.19.xx.xx and
later.
Storage Ensure that the storage
expansion expansion enclosures are
enclosures are powered on and are in optimal
not powered on, state. Use the DS4000 storage
not supported or manager to determine whether
failed. the storage expansion enclosure
is supported by the DS4300
subsystem or not and whether
the storage expansion enclosure
ESMs are in failed state or not.
SFP has failed. Ensure SFP is seated properly;
replace SFP.
Drive failed or Replace drive.
bypassed.
RAID controller Replace the RAID controller.
has failed.
Midplane has Have the midplane replaced
failed (service technician only).
Chapter 6. Solving problems
151