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Question 28

A PowerMax parent Storage Group (SG) contains two child SGs: SG1 and SG2. What is a valid Host I/O limit setting for this configuration?

Parent SG: 400,000 -

SG1: 800,000 -

SG2: 300,000

Parent SG: 500,000 -

SG1: 400,000 -

SG2: NOLIMIT

Parent SG: 500,000 -

SG1: NOLIMIT -

SG2: 1,000,000

Parent SG: 400,000 -

SG1: 500,000 -

SG2: NOLIMIT

Correct Answer: B

The parent Storage Group (SG) sets the overall limit for its child SGs. Consequently, any limits set on the child SGs should not exceed the parent SG's limit in total, but child SGs can have limits that, when combined, exceed the parent's limit, provided the parent SG's combined limit governs the overall I/O. In option B, the parent SG's limit is 500,000, SG1 has a limit of 400,000, and SG2 has NOLIMIT. This is valid because the parent SG's overall limit of 500,000 still controls the maximum I/O, while SG2's NOLIMIT indicates it will be governed by the parent SG's imposed limit.

Discussion

TrinhLKOption: B

The sum of child limits may exceed the parent’s limit; however, the I/O rate of all child SG’s combined will remain limited by the parent’s limit. Also, the individual child SG limits may not exceed the parent’s assigned limit.