Multiple Virtual Storage, more commonly called MVS, was the most commonly used operating system on the System/370 and System/390 IBM mainframe computers. It was developed by IBM, but is unrelated to IBM's other mainframe operating systems, e.g., VSE, VM, TPF.
First released in 1974, MVS was extended by program products with new names multiple times, first to MVS/SE (MVS/System Extension), next to MVS/SP (MVS/System Product) Version 1, next to MVS/XA (MVS/eXtended Architecture), next to MVS/ESA (MVS/Enterprise Systems Architecture), next to OS/390 and finally to z/OS (when 64-bit support was added with the zSeries models). IBM added Unix support (originally called OPEN EDITION) in MVS/SP V4.3 and has obtained POSIX and Unix certifications at several different levels. The MVS core remains fundamentally the same operating system. By design, programs written for MVS run on z/OS without modification.
At first IBM described MVS as simply a new release of OS/VS2, but it was, in fact a major rewrite. OS/VS2 release 1 was an upgrade of OS/360 MVT that retained most of the original code and, like MVT, was mainly written in assembly language. The MVS core was almost entirely written in Assembler XF, although a few modules were written in PL/S, but not the performance-sensitive ones, in particular not the Input/Output Supervisor (IOS). IBM's use of "OS/VS2" emphasized upwards compatibility: application programs that ran under MVT did not even need recompiling to run under MVS. The same Job Control Language files could be used unchanged; utilities and other non-core facilities like TSO ran unchanged. IBM and users almost unanimously called the new system MVS from the start, and IBM continued to use the term MVS in the naming of later major versions such as MVS/XA.
The Ministry of Internal Affairs of Ukraine (Ukrainian: Міністерство внутрішніх справ України, Ministerstvo vnutrishnikh sprav Ukrayiny, MVS) executes state policy for the protection of rights and liberties of citizens, investigates unlawful acts against the interest of society and state, fights crime, provides civil order, ensures civil security, traffic safety, and protects the security and protection of important individuals. It is a centralised agency headed by a Minister of Internal Affairs. The ministry closely operates with the office of General Prosecutor of Ukraine. It oversees the National Police of Ukraine (police service) and the National Guard of Ukraine (gendarmerie).
Formerly, the Ministry directly controlled the Ukrainian national law enforcement agency, termed the militsiya (Ukrainian: міліція). This changed in July 2015, with the introduction of reforms by Ukrainian president Petro Poroshenko to reduce corruption, whereby the militsiya was replaced with the National Police. Ukraine's militsiya was widely regarded as corrupt, and it has received severe accusations of torture and ill-treatment.
MVS is an IBM mainframe computer operating system, commonly known as Multiple Virtual Storage. The acronym MVS may also refer to: