What customer records are required to quickly assess system performance in a z/OS environment?

Question

Options

• ARMF report showing FICON channel statistics
• BNetwork TCP records
• CSCRT records
• DSMF type 70 and 113 records

• A
  6% (4)
• B
  2% (1)
• C
  3% (2)
• D
  89% (55)

Explanation

SMF Type 70 and 113 records are the correct answer because they capture the two most critical dimensions of z/OS system performance: Type 70 records contain processor activity data (CPU utilization, dispatch time, wait states), while Type 113 records capture I/O subsystem statistics for DASD storage (cache hit rates, response times). Together, they give a rapid, comprehensive view of compute and storage bottlenecks without requiring additional processing. Option A is wrong because RMF reports are derived from SMF records and represent a secondary, already-processed view - and FICON channel stats alone are too narrow for overall assessment. Option B (Network TCP records) addresses network-layer performance, which is outside the scope of core z/OS system health metrics. Option C is wrong because SCRT (Sub-Capacity Reporting Tool) records are used for IBM software license charge calculations, not performance analysis.

Memory tip: Think "70 = CPU, 113 = I/O" - those two numbers cover the two performance pillars. If you can't answer "How busy is the processor?" and "How is storage responding?", you can't assess z/OS performance quickly.

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