I have huge simulation directories on the two machines
server and on
cluster which I want to keep synchronized. The basic situation is that files rarely change but when a simulation is done many big files change at once which I'd like to have synchronized as soon as they are closed.
Therefore I assume a cronjob using rsync is not ideal, cronjob because it calls rsync at a fixed time interval which I'd probably choose either too large or to small, rsync because it shouldn't have to check for modifications of files since I and the simulation job are the only ones accessing them.
So my idea would be using inotify (see this question) to detect changes in the simulation directory in a loop and then fork into a rsync for the changed files. However I'm not sure whether that might accidentally skip files closed just when the fork is done. (and possibly I'd also end up in an infinite loop due to inotify calling rsync to sync the just synchronized file again...) So before I try too much there, I repeat my question:
Is there a tool that hooks to two directories and synchronizes them as soon as something changes?
(basically this would be something like an offline dropbox, I guess)