Timothy J Massey wrote at about 15:40:05 -0400 on Tuesday, April 12, 2011: > "Jeffrey J. Kosowsky" <backu...@kosowsky.org> wrote on 04/10/2011 01:57:01 > PM: > > > 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. > > You always have to unmount (for it to work correctly, anyway), whether > you're dd'ing the partition raw or using LVM. The difference with LVM is > that you only have to have it umounted for a brief moment, and without it > for the entire time of the DD.
Well with LVM, if you have a dedicated BackupPC partition, it should be sufficient to make sure no backup (or backuppc nightly process) is running and that you are not at one of the round-number o'clock wakeup times, then just doing a 'sync' followed by a lvm-snapshot should be sufficient. I agree though that unmounting would be simpler though and less likely to make mistakes. > > 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. > > The same thing you'd have to do in any other case: mount it! :) Well with 'dd' I typically do *not* mount it. I do a dd on the unmounted partition (to ensure it is stable). I guess my question is whether I can do the same on an unmounted lvm partition using /dev/lvm-pv/lvm-vg format. I imagine I can... That being said, I have found that at least on my slow machines, lvm-snapshots add a significant slowdown tax... ------------------------------------------------------------------------------ Forrester Wave Report - Recovery time is now measured in hours and minutes not days. Key insights are discussed in the 2010 Forrester Wave Report as part of an in-depth evaluation of disaster recovery service providers. Forrester found the best-in-class provider in terms of services and vision. Read this report now! http://p.sf.net/sfu/ibm-webcastpromo _______________________________________________ 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/
