On Wed, 25 Nov 2020 17:28:35 +0000 "Lux, Jim \(US 7140\) via Beowulf" <beowulf@beowulf.org> wrote:
Hi Jim, what about glusterfs? Three nodes sounds perfect, it should eventually heal itself even if the network is unreliable. Cheers, miroslav > 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) > > -- The Phantom Lodge - http://the-phantom-lodge.com SHALTEV.ORG - http://www.shaltev.org _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit https://beowulf.org/cgi-bin/mailman/listinfo/beowulf
