Storage controller super capacitor adaptive life monitor

Details Storage controller super capacitor adaptive life monitor Storage controller super capacitor adaptive life monitor

2006-06-02

2009-02-03

Maskulinski, Michael C (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

Reexamination Certificate

active

07487391

ABSTRACT:
A storage controller has a capacitor pack for storing energy to supply during a main power loss, a temperature sensor that senses the capacitor pack temperature, and a CPU, which repeatedly: receives the temperature during an interval over which the capacitor pack is operated, determines a lifetime over which the capacitor pack would have a capacity to store at least a predetermined amount of energy if operated at the temperature during the lifetime, normalizes the interval by a ratio of a warranted lifetime of the capacitor pack relative to the determined lifetime, and adds the normalized interval to an accumulated normalized running time. The operating voltage of the capacitor pack may also sampled and used to determine the lifetime. The predetermined amount of energy may be for backing up a volatile write cache to a non-volatile memory in response to the loss of main power.

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