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Guy Harris (talk | contribs) →Virtualization: Again, "network interface card" is a term that does not apply to all adapters. |
Guy Harris (talk | contribs) →Virtualization: [logical partition covers things over than PR/SM, so link to the section about that particular flavor of LPAR. |
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==Virtualization==
[[Hardware virtualization|Virtualization]] is required by default on IBM Z; there is no option to run Linux on IBM Z without some degree of virtualization. (Only the very first 64-bit mainframe models, the z900 and z800, included a non-virtualized "basic mode.") First layer virtualization is provided by the Processor Resource and System Manager ([[logical partition#PR/SM|PR/SM]]) to deploy one or more Logical Partitions (LPARs). Each LPAR supports a variety of operating systems including Linux on IBM Z. A [[hypervisor]] called z/VM can also be run as the second layer virtualization in LPARs to create as many virtual machines (VMs) as there are resources assigned to the LPARs to support them. [[Kernel-based Virtual Machine|KVM]] on IBM Z is another hypervisor option.
When Linux applications in an LPAR access data and applications in other LPARs such as [[CICS]], [[IBM Db2]], [[IBM Information Management System|IMS]], [[Linux]], and other mainframe subsystems running on the same physical mainframe, they can utilize [[HiperSocket]]s – fast, memory-only [[Internet protocol suite|TCP/IP]] connections. As compared to TCP/IP over standard [[network interface controller]] (NICs, also known as Open System Adapters (OSAs) in mainframes), HiperSockets can improve end-user responsiveness (reduce network latency and processing overhead), security (since there's no network connection to intercept), and reliability (since there's no network connection to lose).<ref>{{cite web|title=HiperSockets|url=http://publib.boulder.ibm.com/infocenter/zos/basics/index.jsp?topic=/com.ibm.zos.znetwork/znetwork_85.htm|work=z/OS basic skills information center|publisher=IBM|access-date=5 June 2013}}</ref>
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