![]() ![]() Use of locking services requires a lock structure (called ISGLOCK) to be created in a Coupling Facility (CF). Introduction to Operating Systems Chapter 1 Key concepts in chapter 1 Multilevel implementation also called layered Resources Hardware: provided to the OS Logical (a.k.a. ![]() GRS Star (Parallel Sysplex) - Rather than using a message passing protocol to manage resource ownership succession, GRS uses the locking services provided by the XES (Cross System Extended Services) component of MVS.(October 2009) Global Resource Serialization ( GRS) is the component within the operating system responsible for enabling fair access to serially reusable computing resources, such as datasets and tape drives or virtual resources, such as lists, queues, and control blocks. The GRS component utilizes the Messaging and Group Services provided by XCF to replace and augment the function through the GRS managed CTCAs. Unsourced material may be challenged and. Basic Sysplex - each of the systems in the sysplex has complete connectivity to every other system via CTCAs or ESCON CTCAs, managed by the XCF (Cross System Coupling Facility) component. The problem of scheduling a set of sporadic tasks that share a set of serially reusable, single unit software resources on a single processor is considered.The GRS software sends messages around the ring to ensure the integrity of the complex and to arbitrate correct succession of ownership. GRS Ring - each of the systems (LPARs) are connected with channel-to-channel adapters (CTCAs) in a ring configuration.There are several options to enable this clustering: In order for GRS to serialize resources between multiple systems, the systems must be clustered. ![]()
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