It’s kind of a cluster, but not exactly HPC. What I have is 3 rPi computers, A,B, and C, and what I’d like to do is keep the desktop and some data directories on all of them synchronized. So if on node A, I add something to A:~/Desktop, it (in short order) winds up in the ~/Desktop directory on the other 2 machines.
It’s easy if I’m doing it from another computer – pdsh and similar do a great job turning a single command into 3 (or N). But what if it’s on the node itself. I thought about something like rsync running every second or 10 seconds, or whatever. But maybe there’s a clever-er way. The network connection isn’t perfect, so a “map it to a shared network drive” approach doesn’t work, and there’s no guarantee that the state is the same on all machines (i.e. one might drop off and reset, and be way behind the other two). And, the changes might come from any source (i.e. I can’t run all file changes through some single entry point that does a pdsh like “write 3 times”) Here's a sort of use case: the three nodes are in physically different locations, nominally connected by a network connection that is unreliable. You, user of the system, is at Node A, and in the course of debugging a function, decide that you need to change some files, so you do that, locally. And then, by the time you get to Node B or C, what you did on A is already there. Imagine some sort of distributed industrial control scenario, perhaps. Jim Lux SunRISE Project Manager Jet Propulsion Lab +1(818)354-2075 (office) +1(818)395-2714 (cell)
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