What is the difference between OS390 and ZS

karpagamece · New User Joined: 04 Dec 2004 Posts: 2

what is the difference between OS390 and ZS

kanak · Moderator Joined: 12 Mar 2005 Posts: 260 Location: India

OS/390 system architecture uses a 31-bit binary numbering scheme. Addressable storage can be up to 2GB where as
z/Series server architecture uses a 64-bit binary numbering scheme. Currently, the largest z900 server has an address space of 64GB.

brain_s390 · Active User Joined: 06 May 2005 Posts: 60 Location: Mumbai

A key distinguishing point between z/OS and OS/390 is that z/OS can run in what's called z/Architecture mode when running on IBM's most recent generation of processors, the zSeries processors. A key aspect of z/Architecture is that it can perform both 64-bit real and virtual storage addressing (an extension from 31-bit addressing in OS/390).

MVS is the operating system .The OS/390 and now z/OS are packaging techniques whereby you get MVS plus about 60 other "elements" such as System Managed Storage (DFSMS), a Job Entry Subsystem (JES), a security component (Security Server) etc. In effect, what OS/390 and now z/OS are is a method of bundling what used to be (and sometimes still are) many different IBM system software products into a single installation package, which can be installed all at once instead of a product at a time.

kanak · Moderator Joined: 12 Mar 2005 Posts: 260 Location: India

thnaks brain for ur valuable answer...it is really good one

Dariusz · New User Joined: 11 Aug 2005 Posts: 27 Location: POLAND

Since OS/390 2.10.0 we've got 64 bit architecture(archlvl=2).
More differences we've got in USS and,generaly,for TCP/IP and network service as a INTERNET & e-biznes solutions(WAS,WEBSPHERE...).