IBM Parallel Sysplex: Difference between revisions

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==Parallel Sysplex==

[[File:GDPS.svg|thumb|300px|Schematic representation of a Parallel Sysplex]]

The Parallel Sysplex was introduced with the addition of the [[Coupling Facility]] (CF) with coupling links for high speed communication, with MVS/ESA V5.1 operating system support, together with the mainframe models in April 1994.<ref>{{cite web |url=http://www.redbooks.ibm.com/redbooks/pdfs/sg244356.pdf |title=Archived copy |accessdate=2007-09-17 |deadurl=yes |archiveurl=https://web.archive.org/web/20110518132944/http://www.redbooks.ibm.com/redbooks/pdfs/sg244356.pdf |archivedate=2011-05-18 |df= }} System/390 Parallel Sysplex Performance - IBM Redbook. Retrieved 17-09-2007.</ref>

The Coupling Facility (CF) may reside on a dedicated stand-alone server configured with processors that can run Coupling Facility control code (CFCC), as integral processors on the mainframes themselves configured as ICFs (Internal Coupling Facilities), or less common, as normal LPARs. The CF contains Lock, List, and Cache structures to help with serialization, message passing, and buffer consistency between multiple LPARs.<ref>http://www.ibm.com/common/ssi/fcgi-bin/ssialias?infotype=SA&subtype=WH&attachment=ZSW01971USEN.PDF&appname=STGE_ZS_ZS_USEN&htmlfid=ZSW01971USEN Coupling Facility Configuration Options .</ref>