We had an outage cause by an overloaded Coupling Facility. It’s in a parallel sysplex with eight Images and z/OS 1.13 RSU1206 and DB2 10. All images are on Z196, also the CF, with CFCC 17. What happened is that a DB2 CF structure (a group buffer pool) was flooded by applications doing tablespace scan. A lot of directory reclaims occurred. The CF was not able to handle this high number of GBP requests which resulted in increased CPU activity for this structure. The CPU Utilization of the CF got up to 75%. The application has requested more and more GBP entries which slowed down the whole sysplex. Also applications using other structures in the CF had been nearly blocked. Did some experience similar problems with overloaded CF’s ? Brgds Markus Haselbach
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