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WebSphere Application Server for z/OS

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IBM WebSphere Application Server for z/OS is one of the platform implementations of IBM's WebSphere Application Server family. The current version is Version 7.0.

The open standard interfaces supported by WAS are common across all platforms provided the version and release levels are aligned. However, the functional implementation below the open standard specification line differs between platforms. That allows the specific attributes of the platform to be exploited without jeopardizing the common programming interface at the specification level and above.

WAS z/OS Platform Exploitation

The WebSphere Application Server for z/OS V7 product has code to directly exploit the following attributes of the platform:

  • WLM—is used for transaction classification, workload routing, server expansion and relative resource allocation
  • SAF—products implemented behind the SAF interface (such as IBM's RACF) provide security definition and security enforcement for the product
  • Cross-memory communications—shared memory buffer exchanges is at the heart of the WebSphere Optimized Local Adapters
  • SMF—WAS z/OS writes SMF 120 records, including the new 120 subtype 9 introduced in WAS z/OS V7
  • RRS—used for global syncpoint coordination between WAS z/OS and other participants in two-phase commit global transactions
  • zAAP—specialty processors are used for Java workload to enhance the financial profile of the product


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