Each LPAR can be configured to either "see" or "not see" the virtualized I/O ports to establish desired "shareness" or isolation. The hardware component that provides this capability is called the Channel Subsystem. They are virtualized and shared across all LPARs. I/O resources such as IP and SAN ports can also be added dynamically. CPU and memory resources can be non-disruptively added to the system and dynamically assigned, recognized, and used by LPARs. IBM Z's PR/SM and hardware attributes allow compute resources to be dynamically changed to meet workload demands. z/VM LPARs allocated within PR/SM LPARs can run a very large number of virtual machines as long as there are adequate CPU, memory, and I/O resources configured with the system for the desired performance, capacity, and throughput. These can be considered virtual "bare metal" servers because PR/SM allows CPUs to be dedicated to individual LPARs. The first layer of IBM Z virtualization (PR/SM) allows a z machine to run a limited number of LPARs (up to 80 on the IBM z13). 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. Each LPAR supports a variety of operating systems. First layer virtualization is provided by the Processor Resource and System Manager (PR/SM) to deploy one or more Logical Partitions ( LPARs). Virtualization is required by default on IBM Z systems. Many applications written for these systems can still run unmodified on the newest IBM Z system over five decades later. In effect, current systems are the direct, lineal descendants of the System/360, announced in 1964, and the System/370 from the 1970s.
IMPLEMENTATION IBM ZCLOUD FULL
The IBM Z family maintains full backward compatibility.
The systems are built with spare components capable of hot failovers to ensure continuous operations. The zSeries, zEnterprise, System z and IBM Z families were named for their availability – z stands for zero downtime.
In July 2017, with another generation of products, the official family was changed to IBM Z from IBM z Systems the IBM Z family now includes the newest model, the IBM z16, as well as the z15, the z14, and the z13 (released under the IBM z Systems/IBM System z names), the IBM zEnterprise models (in common use the zEC12 and z196), the IBM System z10 models (in common use the z10 EC), the IBM System z9 models (in common use the z9EC) and IBM eServer zSeries models (in common use refers only to the z900 and z990 generations of mainframe). IBM Z is a family name used by IBM for all of its z/Architecture mainframe computers. On the right is the IBM LinuxONE Rockhopper. On the left is the IBM z13 (while the naming was changed, the z13 line had a zSystems label on doors).
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