Carl Wilhelm Soderstrom wrote: > On 02/07 10:33 , Robin Lee Powell wrote: >> Y'all have made it clear that rsync -H doesn't work too well with >> backuppc archives; what about cpio? Does it do a decent job of >> preserving hard links without consuming all your RAM? > > probably works fine; if you can take the time to transfer all the data. > dd is definitely the fastest way to go; because it doesn't follow all the > hardlinks. it's several times faster than tar or cpio (for copying backuppc > data pools) in my experience.
Cpio would avoid the per-file RAM requirement that rsync has, but you still have the issue of having to do a table lookup for the inode/filename mapping which slows down as the number of links grows. There is another possibility if someone has time to experiment. There is a block-device mirroring tool for linux called DRBD that in recent versions has a facility to check/repair the remote copy. I don't know if it is as efficient as rsync, but it might be worth a try. I'm generally paranoid about things that do a real-time of your only copies, though, since it will propagate any problem. But, if this works well enough to use remotely it might be possible to keep two or more copies and rotate between them doing a re-sync. The usual purpose for this tool is to keep local redundant failover servers in sync so it may be hard to find examples of using it to maintain a remote snapshot, and probably even harder if you also want to combine it with a block level encryption layer (and/or use a file instead of a block device for the image), but conceptually it seems possible. http://www.drbd.org/ -- Les Mikesell [EMAIL PROTECTED] ------------------------------------------------------------------------- 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 [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
