[email protected] wrote at about 17:19:09 +0700 on Sunday, April 10, 2011: > On Sun, Apr 10, 2011 at 12:16 PM, Les Mikesell <[email protected]> wrote: > > I've never heard of raid sync affecting the original disk(s). I've been > > doing > > it for years, first with a set of firewire external drives (which also had > > USB > > but it was slower), then the sata bays. There might be problems in adding > > more > > members than originally created in the set, though. In your situation I > > would > <snip> > > FYI for all, not doubting Les' good experience doing this (using > mdraid mirroring as a user-land tool to mirror a partition to an > external drive for offsite backup rotation): > > I had a pretty extensive discussion with the Linux-RAID list on > thisand the general conclution was that the way mdraid does the > mirroring would just add unnecessary kruft to the resulting filesystem > and make recovery more difficult. > > The bottom line from them was that rather than using RAID to do the > mirroring to a removable drive, better to just use a tool like DD. > When I expressed that I wanted a bit more assurance of a "bit-perfect" > mirror being done, and was directed to these enhanced versions: > > http://dc3dd.sourceforge.net/ > http://www.forensicswiki.org/wiki/Dc3dd > > Of course there are many COTS "partition cloning" tools out there as > well if that's a better fit for a given situation.
The only problem with dd is that you would generally need to either make a "snapshot" (e.g., using lvm2) or shutdown BackupPC and unmount the drives to assure a perfect partition copy. I'm not sure though how a 'dd' of an lvm2 snapshot works and what you would need to do on the new drive to get it to mount. ------------------------------------------------------------------------------ Xperia(TM) PLAY It's a major breakthrough. An authentic gaming smartphone on the nation's most reliable network. And it wants your games. http://p.sf.net/sfu/verizon-sfdev _______________________________________________ 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/
