Discussion
Durability of a storage service refers to
Answer: A
Correct answer: the probability that stored data is not lost
Durability and availability are different guarantees. Durability is about permanence - whether the bytes still exist - and is quoted as a number of nines per year. Availability is about reachability at a given moment. A service can be highly durable and briefly unavailable, which is the normal case during an outage: the data is intact and cannot be read for an hour.
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