Virtualization on IBM z
Since the beginning, IBM z systems have always performed virtualization. And by its very architecture, it can virtualize all kinds of resources (CPU, memory, network access, etc ...) up to 100% utilization rates. Today, on the latest machines, it is thus possible to deploy thousands of virtual servers on a single mainframe.
IBM z systems offer the possibility of 3 virtualization technologies:
- A hardware hypervisor (PR/SM) that partitions the hardware into multiple (up to 80) logical partitions (LPAR) that will share dynamically, as needed, all the hardware resources (memories, disks, etc.).
- A software hypervisor (z/VM) which can define multiple (up to tens and tens of thousands of) "virtual machines" (of type z/OS, z/VM, or LINUX) directly on the IBM z platform, or within a partition (LPAR).
- Another software hypervisor (KVM) is also available for those who are interested in virtualizing only LINUX "machines".