Oracle Real Application Clusters on IBM AIX Best practices in memory tuning and configuring for system stability

Introduction

Customers who experience Oracle Real Application Clusters (RAC) node evictions due to excessive AIX kernel paging should carefully review and implement these recommended best practices. Testing and experience have found that memory over commitments may cause scheduling delays for Oracle’s ‘oprocd’ process resulting in node evictions.
Implementing all of these recommendations will reduce scheduling delays and corresponding oprocd initiated evictions.

Problem validation

This paper addresses the best practices for environments experience node evictions caused bycritical processes not being able to get scheduled in a timely fashion on AIX due to memory overcommitment. To validate that node evections are caused by this situation, the followingvalidation steps should be taken.

Click link below…

rac_aix_memory_tuning October 17 2011

Enjoy

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