UX, AIX, FLAYX...

[Sridhar Ayengar]

Patrick Finnegan wrote:
>> Indeed, tho' I don't know a lot about mainframes, I have a feeling
>> that most Linux/390 is deployed on z/VM - which is to say, in an LPAR
>> under VM - rather than under z/OS, which is to say, MVS. Linux is
>> probably actually displacing MVS - z/OS - rather than helping it.
> 
> Yeah, but zVM isn't free any more than zOS is.  In effect, "zLinux" is 
> helping IBM sell zVM.  (And, more importantly to IBM, helping to sell 
> maintenance contracts, and consulting work).

I suspect it's probably actually helping to sell z/OS too.  z/OS does 
high-performance database work much better than Linux.  Why have a 
separate database server and a separate web server when you can do both 
on the same machine and have them talk to each other over high-speed 
intra-machine links instead of much slower LAN or cluster interconnect 
hardware?

Linux has definitely started to displace z/VSE though.  There's a bit 
too much overlap.  I have seen installation with all three (and 
sometimes even z/TPF and others) on the same machine for the same 
application systems.

Peace...  Sridhar