Difference between AIX and OpenVMS

1. AIX :
AIX is a series of proprietary operating systems which is provided by IBM. AIX stands for Advanced Interactive eXecutive. Initially, it was designed for the IBM RT PC RISC workstation and later it was used for various hardware platforms like IBM RS/6000 series, PowerPC-based systems, System-370 mainframes, PS-2 personal computers and Apple Network Server. It is one of the five commercial operating systems that have versions certified to UNIX 03 standard of The Open Group. The first version of AIX was launched in 1986. The latest stable version of AIX is 7.2.

2. OpenVMS :
OpenVMS is a multi-user and multi-processing operating system which was developed by Digital Equipment Corporation (DEC). It is a virtual memory-based operating system that is designed for use in time-sharing, batch processing, and transaction processing. It is available for many platforms including servers and workstations. It is written using BLISS, VAX Macro, C, Ada, PL/I, Fortran, UIL, Pascal, SDL, C++, and DCL. The first version of OpenVMS was launched in 1977. The kernel used in this operating system is monolithic with modules.

Difference between AIX and OpenVMS :

AIX	OpenVMS
It was developed and is owned by IBM.	It was developed by Digital Equipment Corporation (DEC).
It was launched in 1986.	It was launched in 1977.
Its target system type is Server, NAS and workstation.	Its target system types are server and workstation.
Computer architectures supported are POWER, PowerPC-AS, PowerPC and Power ISA.	Computer architectures supported by OpenVMS are VAX, Alpha and IA-64.
Kernel type is Monolithic with modules.	Its kernel type is Monolithic with modules.
The native APIs are SysV/POSIX.	Its native APIs are Proprietary.
Preferred license is Proprietary.	It has the preferred license of Proprietary.
It has default GUI ‘on’.	It does not have default GUI ‘on’.
The non-native APIs supported through its subsystems are DOS API.	The non-native APIs supported through its subsystems are POSIX.
File systems supported are JFS, JFS2, ISO 9660, UDF, NFS, SMBFS and GPFS.	File systems supported by OpenVMS are Files-11, ISO 9660, NFS and CIFS.