Diagnosing global resource serialization
Occasionally, situations will arise during the operation of a global resource serialization complex where workload slows down or comes to a complete halt. There are times when these situations are due to problems with the allocation of global resource serialization managed (ENQ) resources. This topic describes strategies to aid in the diagnosis and correction of these problems in a sysplex environment for either a global resource serialization ring complex or a global resource serialization star complex.
This covers the following topics:
- Discriminating between system and application problems
- Check if the complex is operating normally
- Tuning the global resource serialization ring
- Ring disruption recovery
- Global resource serialization ring rebuild
- Checking XCF/XES connectivity and performance
- ISGLOCK structure request processing
- Checking for ENQ contention problems
- Using SMF 87 records