Global resource serialization
This chapter describes the global resource serialization (GRS) enhancements, functions, and features that were introduced with IBM z/OS Version 2 Release 1 (2.1).
In z/OS 2.1 you can change enqueues (ENQs) from exclusive to share through a macro ISGENQ REQUEST=CHANGE,CONTROL=EXCLUSIVE parameter. The version also adds the support of a Fibre Channel Connection (FICON) channel-to-channel global resource serialization (GRS) Ring mode, which permits GRS-managed channel-to-channel (CTC) connections on an IBM zEnterprise ...

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