The Penguin and the Dinosaur
Perhaps I've convinced you Linux/390 is cool, and you'd like to see it for yourself. Now, you probably have a problem: you do not have access to a System/390. There are at least three ways you can play with Linux/390 without already having an actual System/390.
The least interesting option is to do what the IBM guys did initially and download their glibc, gcc and kernel patches, and build L/390 software in a cross-compilation environment hosted under Linux/x86. Sure, this works, but it's not very much fun. For the experience, you need to be running L/390 itself, which requires a System/390.
The expensive option is to buy a mainframe. A minimal P/390 on the used market will set you back less than $10,000. That's not all that much, is it? Okay, so $10,000 might be a little steep for a neat toy.
You'd still like to play, but can't spend ten grand? How does “free” sound, then? Free, as in beer and speech. Roger Bowler has written an intensely cool emulator, Hercules, which runs under Linux and emulates either a System/370 (the previous generation of IBM mainframe) or a System/390; it also emulates many of the more common mainframe peripherals. It's open source (not GPL, but the license is quite reasonable, basically just forbidding commercial use) and very easy to build. The emulator is sufficiently thorough to boot OS/MFT (a simpler IBM mainframe OS, circa 1966) and use MFT to build and boot OS/MVT (MVS's progenitor). Work is being done to bring MVS 3.8 up on it.
More to the point, Hercules emulates a System/390 well enough to boot Linux/390. I've put up a page explaining how; see the Resources section. Currently, it's not yet useful; there is no network device emulation, so getting stuff into and out of the machine is difficult. It can, we think, be done with the supplied tools and tape image files. By the time you read this, someone will probably have figured out how to load the Marist file system onto a 3330 image, which would allow for actual development. Hopefully, it will not take too long to develop enough network support to allow the virtual S/390 to appear on the network, in the same way VMWare machines do.
Be warned: you'll need patience. On my PII-300, Hercules takes close to an hour to boot Linux, although once it's up and running, interactive performance is not actually bad at all (I started playing with Linux on a 4MB 386/25, and Hercules is no more painful than it was). Many people on the Hercules mailing list (sign up from the Hercules home page) are aggressively working on performance-tweaking Hercules, so its speed should increase significantly. The referenced page will contain updates as we turn Hercules into a reasonable development environment for L/390, so check back often.
It's a grand adventure; we're exploring new territory every day. We need your help. Hop aboard, and bring your penguins. The dinosaur doesn't bite. Honest.
Adam J. Thornton has been using Linux since 0.09, making him older than he cares to contemplate. He distinctly remembers thinking SLS was for sissies. When he's not hunched troglodytically in front of his monitor, he enjoys playing with his Greater Swiss Mountain Dog Vinnie, bicycling with his fiancee Amy, and drinking Scotch, but not all at the same time. Write him at email@example.com.
Fast/Flexible Linux OS Recovery
On Demand Now
In this live one-hour webinar, learn how to enhance your existing backup strategies for complete disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible full-system recovery solution for UNIX and Linux systems.
Join Linux Journal's Shawn Powers and David Huffman, President/CEO, Storix, Inc.
Free to Linux Journal readers.Register Now!
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Petros Koutoupis' RapidDisk
- ServersCheck's Thermal Imaging Camera Sensor
- The Italian Army Switches to LibreOffice
- Linux Mint 18
- Oracle vs. Google: Round 2
- The FBI and the Mozilla Foundation Lock Horns over Known Security Hole
- Privacy and the New Math
- Varnish Software's Varnish Massive Storage Engine
Until recently, IBM’s Power Platform was looked upon as being the system that hosted IBM’s flavor of UNIX and proprietary operating system called IBM i. These servers often are found in medium-size businesses running ERP, CRM and financials for on-premise customers. By enabling the Power platform to run the Linux OS, IBM now has positioned Power to be the platform of choice for those already running Linux that are facing scalability issues, especially customers looking at analytics, big data or cloud computing.
￼Running Linux on IBM’s Power hardware offers some obvious benefits, including improved processing speed and memory bandwidth, inherent security, and simpler deployment and management. But if you look beyond the impressive architecture, you’ll also find an open ecosystem that has given rise to a strong, innovative community, as well as an inventory of system and network management applications that really help leverage the benefits offered by running Linux on Power.Get the Guide