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z/OS Performance: Capture Ratio Considerations for z/OS and IBM System z Processors V2



Document Author:
Additional Author(s):

Kathy Walsh
Kathy Walsh


Document ID:

FLASH10526


Doc. Organization:

Advanced Technical Sales


Document Revised:

03/26/2007


Product(s) covered:

z9-109; z9 BC; z9 EC; zSeries 800; zSeries 890; zSeries 900; zSeries 990; zSeries; z/OS; z/OS.e







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.

rmpttom_v2.1.pdf



Classification:

Hardware; Software

Category:

Performance




Platform(s):

IBM System z Family

S/W Pillar(s):

IBM System z Software

O/S:

z/OS

Keywords:

z/OS Capture Ratio, uncaptured time, RMPTTOM

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