IBM System Storage DS4000, Hardware Maintenance Manual

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Table 34. Symptom-to-FRU index for DS4300 storage server (continued)
One or more green LEDs off - Front panel
1.
Make sure that the cords are plugged in and power supplies are
turned on.
2. Midplane
Green one or more LEDs off - Battery charging
1.
Battery or battery charger failed.
One or more green LEDs off - Cache active
1. Use the storage management software to enable the cache or
there is no data in the cache.
2.
RAID controller
3. Battery
One or more green LEDs off - RAID controller Host Loop
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
One or more green LEDs off - RAID controller Loop
1. RAID controller
2. Drive
3.
SFP or fibre channel cable
Intermittent or sporadic power loss to the storage server -
Some or all FRUs
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
Unable to access drives on Drives and fibre channel loop
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)
Random errors on subsystem
1. Midplane
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IBM TotalStorage DS4000: Hardware Maintenance Manual