000-221 Question #93: Real Exam Question with Answer & Explanation

The correct answer is C. Above 10 pages per CPU per second. AIX paging concern thresholds scale with CPU count, so the standard guideline is 10 pages per CPU per second rather than a fixed absolute value.

Question

An LPAR has 32 CPUs, and is reporting hundreds of page-ins and page-outs per second. At what level of paging should the administrator become concerned?

Options

AAbove the size of the paging space size in 4KB pages
BAbove 50 pages per second
CAbove 10 pages per CPU per second
DAbove 10 pages per GB of allocated memory per second
EAbove the number of paging space disks

Explanation

AIX paging concern thresholds scale with CPU count, so the standard guideline is 10 pages per CPU per second rather than a fixed absolute value.

Common mistakes.

A. Paging space size in 4KB pages is a capacity metric, not a performance rate threshold, and has no defined relationship to when paging rates become problematic.
B. A flat 50 pages per second ignores CPU count entirely, making it meaninglessly restrictive for large LPARs and too permissive for small ones.
D. IBM's paging concern guideline is CPU-relative, not memory-relative; allocated memory size is not the scaling factor used in AIX performance tuning standards.
E. The number of paging space disks is a storage configuration value that affects throughput capacity, not a defined rate threshold for performance concern.

Concept tested. AIX paging performance threshold per CPU

Reference. https://www.ibm.com/docs/en/aix/7.3?topic=performance-monitoring-tuning-guide

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