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Which of the following refers to the amount of time it will be expected to take to get a device fixed and back

Which of the following refers to the amount of time it will be expected to take to get a device fixed and back into production?

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A.
SLA

B.
MTTR

C.
Hot-swap

D.
MTBF

Explanation:
B: Mean time to repair (MTTR) is the amount of time it will be expected to take to get a device fixed and back into production. For a hard drive in a redundant
array, the MTTR is the amount of time between the actual failure and the time when, after noticing the failure, someone has replaced the failed drive and the
redundant array has completed rewriting the information on the new drive. This is likely to be measured in hours. For a nonredundant hard drive in a desktop PC,
the MTTR is the amount of time between when the drive goes down and the time when the replaced hard drive has been reloaded with the operating system,
software, and any backed-up data belonging to the user. This is likely to be measured in days. For an unplanned reboot, the MTTR is the amount of time between
the failure of the system and the point in time when it has rebooted its operating system, checked the state of its disks, restarted its applications, allowed its
applications to check the consistency of their data, and once again begun processing transactions.
+ A is incorrect because a service-level agreement (SLA) addresses the degree of availability that will be provided to a customer, whether that customer be an
internal department within the same organization or an external customer. The MTTR is the amount of time it will be expected to get a device fixed and back into
production. The MTTR may pertain to fixing a component or the device or replacing the device.
+ C is incorrect because hot-swapping refers to the replacement of a failed component while the system continues to run and information remains available.
Usually degraded performance results, but unplanned downtime is avoided. Hot-swapping does not refer to the amount of time needed to get a system back up
and running.
+ D is incorrect because MTBF refers to mean time between failure, which is the estimated lifespan of a piece of equipment. It is calculated by the vendor of the
equipment or a third party. The reason for using this value is to know approximately when a particular device will need to be replaced. It is used as a benchmark
for reliability by predicting the average time that will pass in the operation of a component or a system until it needs to be replaced.

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