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Line 21: ==Hardware partitioning== Logical partitioning divides hardware resources. Two LPARs may access [[memory (computers)\|memory]] from a common memory chip, provided that the ranges of addresses directly accessible to each do not overlap. It is possible for one partition to control memory managed by a second partition indirectly by communicating with a process on the partition with direct access, which acts as an intermediary. [[CPU]]s may be dedicated to a single LPAR or shared. While on Amdahl's MDF (Multiple Domain Facility) it was possible to configure an LPAR with both shared and dedicated CPUs., ~~This~~this is no longer possible with any mainframes currently in the market. On IBM mainframes, LPARs are managed by the [[PR/SM]] facility or a related, optional, simplified facility called Dynamic Partition Manager (DPM). All 64-bit IBM mainframes, except for the first generation 64-bit models (z900 and z800), operate exclusively in LPAR mode, even when there is only one partition on a machine. Multiple LPARs running z/OS can form a [[Sysplex]] or [[IBM Parallel Sysplex\|Parallel Sysplex]], whether on one machine or spread across multiple machines.<ref name="redbooks.ibm.com">{{cite web \|url=http://www.redbooks.ibm.com/abstracts/sg247803.html \|title=Security on the Mainframe \|date=2009-12-02 \|accessdate=2010-01-14 \|first=Karan \|last=Singh}}</ref>

Logical partition: Difference between revisions