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- IBM_mainframe_expanded_storage abstract "Traditionally IBM Mainframe memory has been byte-accessible. This kind of memory is termed "Central Storage". IBM Mainframe processors - through much of the 1980s and 1990s - supported another kind of memory - Expanded Storage.Expanded Storage is 4KB-page addressable. When an application wants to access data in Expanded Storage it must first be moved into Central Storage. Similarly, data movement from Central Storage to Expanded Storage is done in multiples of 4KB pages. Initially page movement was performed using relatively expensive instructions, by paging subsystem code. In 1989, however, the MVPG (Move Page) instruction was introduced, decreasing the cost for single page moves. In 1992 the ADMF (Asynchronous Data Mover Facility) was introduced - to reduce the cost of moving groups of pages between Central and Expanded Storage.The MVPG instruction and ADMF are explicitly invoked - generally by middleware in z/OS or z/VM (and ACP?) - to access data in expanded storage. Some uses are namely: MVPG is used by VSAM Local Shared Resources (LSR) buffer pool management to access buffers in a hiperspace in Expanded Storage. Both MVPG and ADMF are used by DB2 to access hiperpools. Hiperpools are portions of a buffer pool located in a hiperspace. VM Minidisk CachingUntil the mid-1990s Central and Expanded Storage were physically different areas of memory on the processor. Since the mid-1990s Central and Expanded Storage were merely assignment choices for the underlying processor memory.These choices were made based on specific expected uses:For example, Expanded Storage is required for the Hiperbatch function (which uses the MVPG instruction to access its hiperspaces).In addition to the hiperspace and paging cases mentioned above there are other uses of expanded storage, including: Virtual I/O (VIO) to Expanded Storage which stored temporary data sets in simulated devices in Expanded Storage. (This function has been replaced by VIO in Central Storage.) VM Minidisk Caching.z/OS removed the support for Expanded Storage. All memory in z/OS is now Central Storage. z/VM continues to support Expanded Storage.".
- IBM_mainframe_expanded_storage wikiPageID "13954061".
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- IBM_mainframe_expanded_storage wikiPageOutDegree "7".
- IBM_mainframe_expanded_storage wikiPageRevisionID "641400639".
- IBM_mainframe_expanded_storage wikiPageWikiLink 360_mainframe_line.
- IBM_mainframe_expanded_storage wikiPageWikiLink IBM_DB2.
- IBM_mainframe_expanded_storage wikiPageWikiLink Mainframe_computer.
- IBM_mainframe_expanded_storage wikiPageWikiLink VSAM.
- IBM_mainframe_expanded_storage wikiPageWikiLink Virtual_Storage_Access_Method.
- IBM_mainframe_expanded_storage wikiPageWikiLink OS.
- IBM_mainframe_expanded_storage wikiPageWikiLink VM.
- IBM_mainframe_expanded_storage wikiPageWikiLinkText "IBM mainframe expanded storage".
- IBM_mainframe_expanded_storage wikiPageWikiLinkText "expanded storage".
- IBM_mainframe_expanded_storage hasPhotoCollection IBM_mainframe_expanded_storage.
- IBM_mainframe_expanded_storage wikiPageUsesTemplate Template:Compu-storage-stub.
- IBM_mainframe_expanded_storage wikiPageUsesTemplate Template:Mainframe-compu-stub.
- IBM_mainframe_expanded_storage wikiPageUsesTemplate Template:Multiple_issues.
- IBM_mainframe_expanded_storage subject 360_mainframe_line.
- IBM_mainframe_expanded_storage type Article.
- IBM_mainframe_expanded_storage type Article.
- IBM_mainframe_expanded_storage type Computer.
- IBM_mainframe_expanded_storage comment "Traditionally IBM Mainframe memory has been byte-accessible. This kind of memory is termed "Central Storage". IBM Mainframe processors - through much of the 1980s and 1990s - supported another kind of memory - Expanded Storage.Expanded Storage is 4KB-page addressable. When an application wants to access data in Expanded Storage it must first be moved into Central Storage. Similarly, data movement from Central Storage to Expanded Storage is done in multiples of 4KB pages.".
- IBM_mainframe_expanded_storage label "IBM mainframe expanded storage".
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- IBM_mainframe_expanded_storage sameAs Q5969181.
- IBM_mainframe_expanded_storage wasDerivedFrom IBM_mainframe_expanded_storage?oldid=641400639.
- IBM_mainframe_expanded_storage isPrimaryTopicOf IBM_mainframe_expanded_storage.