Take a look at the GRS monitoring tool (MVS Planning: Global Resource 
Serialization - SA22-7600). It will give you an insight into what GRS is doing. 
(GRS may not be your problem!)

John

>We have a 6 way sysplex. I'm looking at some performance issues for XCF
>traffic. When I look at the outbound requests, I notice that every hour (15
>min interval) group SYSGRS (all members), SYSENF (only one member, CNS
>system) and IXCLO012 (all members) has a very high rate of outbound
>requests. It's between 2-6 times more outbound req. than the other three 
15-
>min intervals on an hourly basis. Every hour looks the same. I have looked at
>this forum and some other manuals/forums, but don't find a clear answer. GRS
>doing something, application related................? Any idea or related
>documentation I can look at.
>/Tomas

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