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Virtualization began in the 1960s with IBM CP/CMS. [1] The control program CP provided each user with a simulated stand-alone System/360 computer. In hardware virtualization , the host machine is the machine that is used by the virtualization and the guest machine is the virtual machine.
Later, IBM released a Virtual Tape Server (VTS) introduced in 1997. It was targeted for a mainframe market, where many legacy applications tend to use a lot of very short tape volumes. It used the ESCON interface, and acted as a disk cache for the IBM 3494 tape library. A competitive offering from StorageTek (acquired in 2005 by Sun ...
IBM's CP/CMS, the first systems to allow full virtualization, implemented time sharing by providing each user with a single-user operating system, the Conversational Monitor System (CMS). Unlike virtual memory, a system virtual machine entitled the user to write privileged instructions in their code.
IBM Spectrum Virtualize is a block storage virtualization system. Because the IBM Storwize V7000 uses SVC code, it can also be used to perform storage virtualization in exactly the same way as SVC. Since mid-2012 it offers real time compression with no performance impact, saving up to 80% of disk utilization.
A hypervisor, also known as a virtual machine monitor (VMM) or virtualizer, is a type of computer software, firmware or hardware that creates and runs virtual machines.A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine.
A basic problem with the system was seen at IBM's field sales level: VM/CMS demonstrably reduced the amount of hardware needed to support a given number of time-sharing users. IBM was, after all, in the business of selling computer systems. Melinda Varian provides this fascinating quote, illustrating VM's unexpected success: [20]
On 7 October 2010, IBM announced the IBM Storwize V7000, the first member of the Storwize family. [8] Storwize uses the SAN Volume Controller code base with internal storage to provide a mid-price storage subsystem. [9] The IBM Storwize V5000, V3700 and V3500 are shrunk compatible models with less cache/CPU/adapters and a reduced set of features.
Software-defined storage typically includes a form of storage virtualization to separate the storage hardware from the software that manages it. [1] The software enabling a software-defined storage environment may also provide policy management for features such as data deduplication , replication, thin provisioning , snapshots and backup.