One Bank Of Leds Not Lit; One Amber Led Lit; Two Amber Leds Lit - HP Surestore Disk Array 12h - And FC60 Service Manual

Appendix D. Back-to-Back Racking
Problem Resolution

One bank of LEDs not lit

When one bank of LEDs is not lit (no green and no amber), power to one of the PDUs has failed. One or
two of the cooling fans are not spinning. The remaining two PDUs are likely to be providing power to the
arrays.
This could be caused by tripped circuit breakers for the circuits delivering power to the rack, or unplugged
power cables. If these are not the causes, problem diagnosis of the rack is as follows:
1. Is a PDU circuit breaker tripped? Check the PDU circuit breakers. The PDUs are located at the
back of the rack. The circuit breakers are black buttons located at the bottom of each PDU.
When the circuit breakers are tripped, the black buttons will be popped out. Locate and remove the
cause of any overload. Reset the circuit breakers by pushing in on the black buttons.
2. Are both plugs of the exhaust fan assembly plugged in? Although unlikely, it is possible that
one of the power cords for the exhaust fan assembly is not plugged in. If necessary, plug the
exhaust fan assembly power cord into its receptacle. (Plug each of the fan assembly power cords
into a different PDU.)
When the power fail condition is corrected, the green LED on the rack front that was not lit should now
light.

One amber LED lit

One or two of the three fans is not operating, probably due to a physical failure. A power failure is ruled
out, as that would cause the complete bank of LEDs to not light.
1. Which fan is not spinning? The exhaust fan assembly is located at the back, top of the. Inspect
the assembly visually to see which fan is not spinning. Replace the exhaust fan assembly.

Two amber LEDs lit

Two or three fans have failed. This condition is unlikely to occur. A power failure is ruled out, as that
would cause both banks of LEDs to not light.
1. Have all fans failed? The exhaust fan assembly is located at the back of the rack, at the top.
Inspect the assembly visually to confirm that no fans are spinning. Replace the exhaust fan
assembly.
CAUTION! This condition is critical, as the fans are not cooling the array enclosures in
the rack, and disk drive reliability may be compromised. The exhaust fan assembly should
be replaced within 48 hours.
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