Les Mikesell wrote: > Timothy J. Massey wrote: > >> Some time ago, someone e-mailed a script that performed a dd/netcat in >> an rsync-like manner: it hashed blocks of the disk and if they matched >> between the two sides they were not sent. If they didn't, the block was >> sent. The idea was to limit the amount of data that would be sent in a >> dd to the relative minimum amount of data that has changed. >> >> I've tried and tried to find this thing, but I just plain cannot--either >> in the list archives or anywhere else Google searches. Does anyone have >> such a script--or even know what I'm talking about? >> >> I think this might have been a home-grown script, but it would be very >> useful, given that currently the only way to effectively clone a backup >> server is dd, and dd'ing a 500GB partition is not exactly practical, >> especially when only a few gig has actually changed from the last time... > > If you are willing to trade disk space for bandwidth, you could dd a > snapshot of the partition to a file locally, then rsync the file to a > remote copy. You'll need twice the space on the remote side if you use > rsync's default behavior of building a complete new copy before > replacing the old. > Is it possible to just rsync the raw disk device? I don't see the point of a dd snapshot, unless you can't get rsync to read from a block device. It certainly can't write to a block device, which is why rsync really won't work.
But, why do you really need to clone a raw disk instead of just rsyncing the content? A raw device copy means that you will end up synchronizing deleted file fragments, and you will need to have the filesystem unmounted. Joe ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
