An emergency power off accidentally occurs in a datacenter during a fire alarm test. On recovery, the server administrator notices that an external storage array is performing consistency checks on
all the volumes configured in the array. Which of the following components of the storage array has MOST likely failed or faulted?
A. Redundant controller
B. Cold spare drive
C. Battery backed cache
D. Cache memory modules
Explanation
RAID arrays use a battery backed cache, so they can process data faster than they can write it. Without the battery, they couldn’t do caching without risk of data loss during a power failure.
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