Diagnosing prolonged catalog ENQ times
When analyzing prolonged catalog ENQ times, verify:
LPAR definition
GRS configuration
Catalog workload
I/O response time and workload
Since elongation of catalog requests could be the result of increased workload, historical data is required to determine if workload has actually increased. SMF records 70-79 and F CATALOG,REPORT,PERFORMANCE command output can provide information concerning workload trends and system utilization.
Prior to any diagnosis, the following tasks should be performed to gather the data that will be required for diagnosing a perceived catalog performance problem:
Document LPAR configuration: This can be obtained from the RMF Partition Data Report.
RMF records 70-79: Insure that SMFPRMxxXnn ...
Get VSAM Demystified now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
