Hello. I suspect that what I want to do is not possible with rsync, but
this is the best place to double-check.
We are pushing files to a remote target that stores them on a very slow
network file system. There are also over a million files on the
target. Consequently, running rsync to push an update takes hours while
the remote side enumerates and stats all those files.
I thought, that wouldn't be necessary if the remote side was running
rsync in daemon mode, and that it only built its internal map of the
files there once after startup, thereafter updating that in-memory list
with every push it receives. For that to work, there would have to be
some flag I could set to promise rsyncd that no files in the target
would be updated through any means other than rsyncd. I looked for such
an option, did some experimenting with write-only targets, straced the
daemon and saw I wasn't getting anywhere.
Our alternatives are options like building a list of what has changed
and copying only those things across. There's some housekeeping and
race condition avoidance in there that makes it more than a couple of
simple commands and replicates some of what rsync knows how to do
already. By any chance is what I want to do possible with rsyncd, or
some other tool?
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