Rsync is a great tool however if you try to rsync a filesystem
with hundreds of thousand files in it the file list can use quite
a large amount of bandwidth even if only a single file has
changed - if you were keeping track of the blocks which had changed
then you do not need to generate this list and simply send over the
changed blocks.

I was not thinking the remote side would mount the image unless
the primary site was offline/unavailable.

Mike.


On Fri, 6 Apr 2007, R. B. Riddick wrote:

--- Mike Wolman <[EMAIL PROTECTED]> wrote:
It could also be used for asynchronous mirrors over slow links, if the log
device was always written to first then the write latency for long distant
links could be removed.  Im not sure if it would be possible to achieve
this using just a modified ggatec instead which has a local device used
as a write cache.

Sounds like rsync can already do that (I am not sure right now, if rsync can
find updated areas within a large file, or if it just copies the while updated
file even if it is a large one)...

Furthermore the remote consumer of that gmirror couldnt be mounted RW, if it
uses UFS, because UFS doesnt allow multiple RW mounts at the same time...

-Arne



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