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10

I don't know if this is widely applicable, but in the 2 places I've worked that had mainframes with programmers on staff, reboots were verboten because of the amount of manual work that it took to get the applications up and running after a reboot. Things like fixing communication problems to other systems, dealing with inconsistent data on disk, etc. In my ...


8

It depends on which part of your question you are emphasizing: importance or usage rates. Mainframes are still very important. They are still heavily relied upon by the financial industry and for many of the critical operations required by large enterprises. IBM has about 90% of that market. Most vendors have cut back on mainframe software development but ...


7

Mainframe-type and Power systems are still very relevant. x86/x86_64 environments are typically built to run 'reasonably' reliably with redundancy built into the software layer. Mainframe/Power systems are built with huge RAS features - properly managed, they are not going down. Another advantage is the massive virtualization partitioning that they can ...


5

Here are some benchmarks for 2.5" drives: http://www.tomshardware.com/charts/2009-2.5-mobile-hard-drive-charts/IOMeter-2006.07.27,1130.html Here are some benchmarks for 3.5" drives: http://www.tomshardware.com/charts/2009-3.5-desktop-hard-drive-charts/IOMeter-2006.07.27,1034.html Taking a look at the top 500GB drive in each section shows us that there is ...


5

In any situation where reboots are infrequent, reboots tend to show up all sorts of unfortunate software bugs that don't occur during normal running. Since these don't come up often, they don't get noticed and therefore don't get fixed. making reboot time a very scary thing. The other issue is that mainframes tend to be doing a lot of different things, and ...


4

It's funny, this is really one of the most interesting questions I've read on SF and I've been thinking about my answer to it longer than I normally would, so here goes. As Robert mentions people have been sounding the death knoll of mainframes since I was a kid and initial thoughts on the subject would be to run away from the area - there's definitely more ...


4

You might want to play a bit with the Hercules emulator from IBM zSeries and it's predecessors. There's a few older releases of OSes like IBM/VM, OS/360, MVS available here. If it's viable? Yes, even if the market share it's limited, is actually quite stable.


4

Yes - depending on what the project is. Linux on z-Series, for example, could be a strong contender for cloud computing.


4

To quote a cartoon " welcome to the wooooorrrllldd of yesterday!!" or something like that. The problem with System Z is it varies wildly in price and performance. And more so than any other platform, You need sysadmins (sysprogs in the Z world) that know what they are doing. I can be a complex environment and its quite different than any other ( in my ...


3

Will your software be running on the mainframe OS or on Linux? There's an excellent free zSeries/System 390 emulator called Hercules which will run z/Linux and even z/OS if you can get your hands of the software itself. I think it's more likely your software will be running on a Linux instance on a zSeries, which makes Hercules the perfect choice.


2

Just so you know where im coming from, Im a 26 yr/old working on mainframes as we speak. I think you would be surprised. Almost all banks use them for their core infrastructure. So although that means that the website where you do your transactions on doesnt run on a mainframe, your account details are on a mainframe. And all interbank transfers of money ...


2

Depends how you see it really. The Mainframe is one area that people expected to die a while ago yet keeps hanging on, and delivers really good availability and power into certain kinds of areas where it's still a good choice for an organisation with a lot of data to process. The approach to the technology in the mainframe arena is very different to that ...


2

It's a while since I've done mainframe work but basically blocksize has an impact on disk utilisation and disk response time. For FB it should be a multiple of the lrecl. Utilisation was related to how many blocks could fit into a track and how well utilised that made the track. For disk response time the recommendation usually came to making the ...


2

You're asking for a large number of characteristics that you won't find in one tool. Many systems engineers end up using multiple tools to manage an environment. This is no different. Server provisioning can be accomplished with Cobbler. It's a good provisioning tool with zVM support. Cobbler can handle the system build, PXE boot and has CLI and web ...


2

Well, two items. First, remember mainframes are COMPLEX and not necessarily all software is made to stop i ncase of a reboot coming - you may run into a lot of issues with processes just interrupted in the middle of something. Manual cleanup time. Something mainframes are actively developped to avoid - with stuff like transactional memory updates (when ...


1

Every fall IBM seems to offer a "Master the Mainframe" contest that might interest you. Registration is closed for 2010, but perhaps the documentation would still be interesting.


1

I have a vax in my garage that I use in every day life. I've installed a dorm-sized fridge on the left, and use the remainder of the cabinet to store tools.


1

Hmm, from the founder of the company: "But they gave me something much more valuable, which was the computer time, and they also gave me the computer terminals. So that’s what put me in business. I got a little 1,000 square foot office in New York, and we divvyed up the $9,500 a month, $1,000 went for the rent. I went to a small space specialist. He ...


1

Here in Sweden, the Swedish Social Insurance Agency recently switched from their old mainframes (Bull) to a UNIX based system. The biggest reason for this being that the employees who know something about their old system has either retired or has delayed their retirement for several years to keep the systems running. I suspect similar migrations will ...



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