Originally posted by uid313
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IBM To Transition Their z/OS, POWER + AIX Compilers To Being LLVM/Clang-Based
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Originally posted by Space Heater View PostIBM's z-series mainframes do not use the POWER ISA, and the microarchitecture is different between z and POWER as well (beyond just the decoder).
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Originally posted by starshipeleven View PostCould you make some examples? I'm curious, I don't know much of z/OS.
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Originally posted by CommunityMember View PostSome financial institutions run on z/OS (so if you don't need money this may not matter to you), and some airline scheduling/planning systems run on z/OS (so if you never leave your basement this may not matter to you), and numerous manufacturing and inventory systems run on z/OS (so if you don't need toilet paper this may not matter to you).
That's at best a vendor lock-in thing where they started using something and it was good enough and now they keep using it because migration costs would be insane.
I mean, there are still poor souls locked to HP-UX and Slowlaris the Unbenchmarkable, this does NOT make them a good OS.
platforms with the same reliability, availability and serviceability as the Z hardware and software,
Because I know of RHEL servers that have been up for nearly a decade with no incidents, and were shut down only recently, when decommissioned and removed from the racks.
Hell, I know of servers rocking Windows 2003 (Windows XP equivalent for servers) that are still up now and operational, never shut down, never crashed. They won't be shut down any time soon as they are part of some industrial automation control infrastructure.Last edited by starshipeleven; 05 March 2020, 12:35 PM.
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Originally posted by starshipeleven View PostCould you make some examples? I'm curious, I don't know much of z/OS.
Many of these use cases have been duplicated in large scale distributed clouds where redundancy through high layering of inexpensive hardware and the use of Linux is prevalent.
It's not like people go out and shop a Z against distributed clouds all the time, because both are expensive, both require certain skillsets and they have to able to support it operationally.
Air traffic control is another good use case. The NGTC (Next Generation Traffic Control System) is supposed to replace an ancient S/360 that is overloaded, and last I read the Z system that was recommended was because it has a better ability to process more datapoints needed for proper airspace management and coordinate those datapoints visually to a ATC representative.
Recently I have seen more and more use of Z/Linux because they want the flexibility and compatibility of Linux based applications, but want the controls of Z/OS. These cases have focused on applications that have a large degree of MQ/DB2 integrations.
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Originally posted by starshipeleven View PostNone of what you said answers the question "what are cases where z/OS is superior to Linux"
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Originally posted by dlcusa View Post
You must be unaware of just how much z/OS offers out of the box vis-à-vis major Linux distros with thousands of supported packages. Just the size of the z/OS documentation is intimidating. For a flavor, look at just one manual and uncover the capabilities of the WLM (workload manager): https://www-01.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R3sc278419/$file/izua300_v2r3.pdf and compare to any distro's capabilities in this area.
Really, you need to understand my point here. It's far from my expertise, and understanding it by reading documentation is impractical (it would need a lot of time and I would need something to experiment/work on), that's why I'm asking for opinions from people that knows them more directly.
I was expecting more down-to-earth answers like "on Z/OS you can do this cool thing, on Linux you cannot".
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Originally posted by dlcusa View PostYour expectations are not my responsibility
WLM is like cgroups on steroids
Really, I'm sick of people that try to look important by pumping up the thing they are working on, that's why I'm low-tolerance.
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