Timothy J Massey wrote at about 18:44:06 -0400 on Tuesday, April 12, 2011: > "Jeffrey J. Kosowsky" <[email protected]> wrote on 04/12/2011 05:10:15 > PM: > > > Timothy J Massey wrote at about 15:40:05 -0400 on Tuesday, April 12, > 2011: > > > "Jeffrey J. Kosowsky" <[email protected]> wrote on > 04/10/201101:57:01 > > > 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. > > Last I looked, if you dd a LVM snapshot of an EXT2/3 partition that is > mounted R/W, it will be marked dirty on mount. If this is not the case, > then yes, quiescing BackupPC is enough.
I thought dynamic snapshots are supported now but I may be wrong... > > However, we're talking about *backup* here. I'm not a big fan of "should > be OK": I'd rather unmount the partition! :) Agreed... as I said it "would be simpler though and less likely to make mistakes" but some people have a strong aversion for some reason to ever taking down a drive... ------------------------------------------------------------------------------ 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 [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
