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?
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A. B. C. D.C.
The scenario described in the question is of an external storage array performing consistency checks on all the volumes configured in the array after an emergency power off. This typically happens when the cache memory module of the storage array is not backed up by a battery and power is lost suddenly, leading to data in the cache getting corrupted. In such a situation, the storage array performs consistency checks on all the volumes to ensure data integrity and correct any inconsistencies found.
Based on this, the component of the storage array that has most likely failed or faulted is the cache memory module, which is responsible for temporarily storing frequently accessed data for quick access. If the cache memory module does not have battery backup, it can result in data corruption, which can cause the storage array to perform consistency checks on all the volumes.
The other options listed in the answer choices are less likely to have caused the issue described in the scenario:
A. Redundant controller: A redundant controller is a backup controller that takes over if the primary controller fails. While a failed redundant controller can cause issues, it is unlikely to be the cause of the consistency checks in this scenario.
B. Cold spare drive: A cold spare drive is a backup drive that is not in use unless a primary drive fails. While a failed drive can cause issues, it is unlikely to be the cause of the consistency checks in this scenario.
C. Battery-backed cache: A battery-backed cache is a cache memory module that has battery backup to ensure data integrity in case of power loss. While a failed battery-backed cache can cause issues, it is unlikely to be the cause of the consistency checks in this scenario. In fact, if the storage array had a battery-backed cache, it would not have needed to perform consistency checks in the first place.
Therefore, the most likely component of the storage array that has failed or faulted in this scenario is the cache memory module without battery backup.