Which factor is most likely responsible for the SL compliance impact?

A PowerMax storage group is no longer SL compliant. No changes to application I/O profile have occurred.

Which factor is most likely responsible for the SL compliance impact?
A . Noisy Neighbor issue
B . Queue depth full event
C . Host queue depth setting was changed
D . Performance thresholds were exceeded

View Answer

Answer: A

Explanation:

A noisy neighbor issue occurs when one or more applications consume more resources than expected, causing performance degradation for other applications. This can affect the SL compliance of a storage group, as the service level defines the expected response time and performance for the applications in that group. If a noisy neighbor consumes too much cache, bandwidth, or CPU cycles, it can cause the SL compliance to drop below the target level. Therefore, answer A is correct.

B, C, and D are incorrect because they are not likely to cause SL compliance impact for a storage group. Queue depth full event (B) is a host-side issue that occurs when the host queue depth is too low or the host I/O rate is too high, causing the host to stop sending I/O requests to the array. Host queue depth setting © is also a host-side parameter that determines how many I/O requests can be queued by the host. Performance thresholds (D) are user-defined values that trigger alerts when certain metrics exceed or fall below the specified levels. None of these factors affect the SL compliance of a storage group on the array.