Dell EMC Exam E20-526 Topic 3 Question 8 Discussion

Actual exam question for Dell EMC's E20-526 exam

Question #: 8
Topic #: 3

A customer is considering migrating their existing non-EMC storage arrays to an XtremIO array. The current environment consists of 350 servers running VMware ESXi 5.5 with 5000 virtual machines. The customer has various tools in place to monitor performance and collect statistics. On average, their service time is 32 ms and utilization is at 75%. In the past, the customer has had performance issues.

Based on Little's Law, what is the calculated response time on the existing environment?

A128 ms

B192 ms

C256 ms

D332 ms

Show Suggested Answer

Suggested Answer: A

Disk service time T(s) = 32 ms (service time for one I/O).

Response time T(r) is calculated as: T(s) / (1 -- Utilization), which here calculates to 32 ms/ (1-0.75) = 128 ms.

References:https://community.emc.com/thread/145100?tstart=0

by Georgene at May 09, 2022, 04:44 PM

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