Tech – Mainframe

Posts related to the mainframe world

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Linklist

8th September 2010 Rui Miguel Feio
Linklist is used to improve the performance of program management and mechanisms utilized to locate and fetch Load modules, such as LLA and VLF. Linklist is a group of system and a user-defined Load library that is a continuation of SYS1.LINKLIB and also indicates the search order the system uses […]
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Virtual Lookaside Facility (VLF)

4th September 2010 Rui Miguel Feio
VLF keeps objects (for example Load modules) in Virtual Storage in order to save I/O operations that would load such objects. Designed primarily to improve performance by retrieving the most currently used objects from Virtual Storage rather then performing repetitive I/O operations from DASD. VLF can be configured by using […]
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Library Lookaside (LLA)

4th September 2010 Rui Miguel Feio
It’s a program management z/OS component that keeps in Virtual Storage Directory entries from Load module libraries, thereby speeding up the fetch of a Load module. LLA improves the performance of Load Module Directory searching on the system. LLA can be a user of VLF facilities to keep copies of […]
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What is a VTAM major node?

4th September 2010 Rui Miguel Feio
A major node is a list of parameters that define a specific type of network device or group of related devices that VTAM can address. To define the attachment of any device or set of devices to VTAM, you need to code a major node member in the VTAMLST data […]