IBM TotalStorage DS4000 Hardware Maintenance Manual page 106

Table 34. Symptom-to-FRU index for DS4300 storage server (continued)
One or more green LEDs off - Front panel
Green one or more LEDs off - Battery charging
One or more green LEDs off - Cache active
One or more green LEDs off - RAID controller Host Loop
One or more green LEDs off - RAID controller Loop
Intermittent or sporadic power loss to the storage server -
Some or all FRUs
Unable to access drives on Drives and fibre channel loop
Random errors on subsystem
78
IBM TotalStorage DS4000: Hardware Maintenance Manual
1. Make sure that the cords are plugged in and power supplies are
turned on.
2. Midplane
1. Battery or battery charger failed.
1. Use the storage management software to enable the cache or
there is no data in the cache.
2. RAID controller
3. Battery
1. Check if host managed hub or switch is on. Replace attached
devices that failed.
2. Ensure that the server whose HBA ports are directly connected to
the DS4300 server host port are power on and that the HBA
driver is installed. Replace the HBA if it failed.
3. Fibre channel cables
4. SFP
5. RAID controller
1. RAID controller
2. Drive
3. SFP or fibre channel cable
1. Check the ac power source.
2. Reseat all installed power cables and power supplies.
3. Replace defective power cords.
4. Check for a Fault LED on the power supply, and replace the
failed FRU.
5. Check to determine if the operating environment temperature is
too hot.
6. Midplane
1. Ensure that the fibre channel cables are undamaged and
properly connected.
2. RAID controller
3. SFPs
4. Drive expansion enclosures are not powered on or are not
working.
5. Drives are not functional (for example, the drives are bypassed)
1. Midplane