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Matches of Mountain Lion and MPE/iX

By Brian Edminster
Applied Technologies

Mountain-lionI follow far too many blogs, in my vain attempt to stay informed on the state of technology (software, hardware, and other). When Apple released its state of the art OS today, I kept on researching. As a byproduct of those attempts, I happened on an article from Information Architects, Mountain Lion’s New File System, and found it quite interesting.

In short, it appears that Apple -- in working to move away from a many-leveled folder hierarchy to 'force' a two-level hierarchy in its file-systems (iOS, and now in OSX) -- is now basically moving towards where MPE was from the beginning.

In MPE's case, it's Account and Group, rather than Application, and folder within Application. But the resemblance is striking.

MPE applications can 'see' -- and when necessary -- access, across accounts. I'm not entirely sure how that'll be achieved in OSX or iOS, although I'm fairly sure that those better-versed in Apple products could point it out to me.

I also noted that, perhaps for different reasons of which I'm not sure -- I'm going purely on conjecture here --Microsoft is doing the same basic thing in its folder structures. The folder structures in Windows 7 are becoming more libraries of 'kinds of things'-based, plus it tries to 'hide' you from the 'pathing' to get to a file. So far, I find their implementation far less satisfying that Apple's has been.

I can't honestly say that (for the filesystem structure, at least) that MPE was so far ahead of its time that other OS's are just now catching up. But I am curious about what drove the two-level structure. Perhaps someone who worked in the labs might have that insight to share. 

Regardless of the reason, good designs often converge in a particular direction or way. And I suspect that this may be an example of that as much that as anything else.

I know that the late Wirt Atmar of AICS Research firmly believed in simple paradigms for storage concepts (often explained as file-cabinet drawers and folders) -- and that MPE's filesystem fit that quite well. He firmly believed that was one of MPE's great strengths.