z/VM Module 1: Introduction. The basic concepts and fundamental ideas of z/VM. IBM, DFSMS/VM, Hipersockets, z/OS, zSeries, z/VM, GDPS, Parallel Sysplex and Tivoli are trademarks of International Business Machines Corporation in the United States, other countries, or both.
The basic concepts and fundamental ideas of z/VM
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Direct Access Storage Devices (DASD) are the main storage device
Minidisks are the partitions of the DASD storage device
These are the physical storage devices that can be virtualized to obtain virtual storage devices
Virtual disks are high speed disks that perform and are capable of the same operations as the physical storage devices
If you have a CP failure or shutdown all virtual devices are lost
Virtual storage increase performance and can increase total size of storage devicesStorage Virtualization
Can be functionally richer than a real environment
Simulates hardware that does not have to exist in the real system, such as virtual tapes
Can share a single copy of an application with many users
Has limitations depending on the hardware
Hardware necessary to accomplish your task can be expensive
Supports only one application for a single userVirtual versus Real Environments
While z/VM has proven itself as an advanced technology, cost effective tool for server consolidation for over 30 years, the advent of Linux running on IBM mainframes has created a new awareness and new demand for the power and flexibility of the IBM virtualization operating system. z/VM provides not only the ability to share hardware and software resources, it also gives the users maximum flexibility to respond to today’s business challenges.