Dell EMC Associate – Backup and Recovery Solutions Design v2 — Question 1

The operating time of a system is 24 hours per day, Monday through Saturday. Failure of the system occurs as follows.

Monday: No failure -
Tuesday: 5 A. M. to 7 A. M.

Wednesday: No failure -
Thursday: 4 P.M. to 8 P.M.
Friday: 8 A. M. to 11 A. M.

Saturday: No failure -
What is the MTBF of the system?

Answer options

• A. 3 hours
• B. 8 hours
• C. 45 hours
• D. 56 hours

Correct answer: A

Explanation

The MTBF is calculated by determining the total operational time minus the total downtime divided by the number of failures. In this case, the system has three failure periods totaling 6 hours, leading to an operational time of 18 hours over 24 hours. Thus, the MTBF is 3 hours, while the other options do not accurately reflect the calculations based on the provided failure times.