Today I have a blog entry about z/VM's history.
45 years ago, on August 2, 1972, IBM announced VM/370 (Virtual Machine Facility/370) - the first VM release. Congratulations to the z/VM team !
As of the announcement letter the availability was planned for November 30, 1972.
The announcement letter stated the VM/370 support, e.g. for the System/370 models 135, 145, 168. May be a few of you still remember those times.
The major functions were multiple concurrent virtual machines with virtual storage support and time sharing support provided by a conversational subsystem (CMS).
Other VM/370 highlights were:
- The execution of multiple concurrent operating systems, such as DOS, DOS/VS (today's z/VSE), OS/MFT, MVT, VS1, VS2 and VM/370 itself.
- Virtual storage facilities for operating systems which do not support dynamic address translation (DAT), such as OS/MFT.
- A general purpose time sharing system suitable for both problem solving and program development available to customers with a 240K byte Model 135.
- Capability of running many types of batch problem-solving applications from a remote terminal with no change in batch programs.
- Up to 16 million bytes of virtual storage available to each user.
- Capability of performing system generation, maintenance, and system testing concurrent with other work.
- A high degree of security, isolation, and integrity of user systems.
- The ability for many users to test privileged code in their own virtual machines.
- An aid in migration from one operating system to another.
- Device address independence for all supported operating systems.
- Multiple forms of disk protection, e.g. preventing users from writing and/or accessing specific disks.
- Ability to use virtual machines to provide backup for other systems.
- Options to improve the performance of selected virtual machines.
- Ability to run many System/370 emulators in virtual machines
45 years later z/VM is the best hypervisor, I know. Without z/VM we could not develop new functions for z/VSE.
If you want to get the latest news about z/VM, please visit the z/VM web page - here.