Abstract: This flash was updated on 3/23/2007. z/OS Performance on IBM System z9 has reported a drop in z/OS capture ratio after migration to a 2094 EC processor. The impact on capture ratio has been traced to the frequency of SRM timer intervals. This flash describes findings regarding the SRM timer interval and it's possible impact on captured time. The flash provides information and recommendations for z/OS tuning. The flash also describes APAR OA18452 taken to address this problem and gives information on the performance benefits seen after application of the fixes.
IBM System z Family
IBM System z Software
z/OS Capture Ratio, uncaptured time, RMPTTOM
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