Re: LVM snapshots vs. --link-dest

2009-10-05 Thread Matt McCutchen
On Mon, 2009-09-28 at 14:18 +, Andrew Gideon wrote: > It assumes that --inplace > actually does what it sounds like it does: it modifies only the disk > pages of a file that have changed, as opposed to changing the entire file > or creating a new file or some other thing which causes the fil

Re: LVM snapshots vs. --link-dest

2009-10-05 Thread Charles Marcus
On 10/5/2009, Ed W (li...@wildgooses.com) wrote: > Ideally I would like to see a kind of half and half maildir/mbox > format emerge for email (perhaps dbox from dovecot will get there?) Guess I should have read your entire email before replying... ;) Its slated for 2.0 now, so will be a bit longe

Re: LVM snapshots vs. --link-dest

2009-10-05 Thread Charles Marcus
On 10/5/2009, Ed W (li...@wildgooses.com) wrote: > If you resist using a fileformat which has some kind of implicit > "chunking" capability (eg maildir isn't perfect, but kind of goes in > the opposite direction and chunks your mail into lots of smaller > files - perhaps too many in the opinion of

Re: LVM snapshots vs. --link-dest

2009-10-05 Thread Ed W
Andrew Gideon wrote: I currently do incremental backups using --link-dest. Unchanged files are hard links to the previous snapshot; changed files are new copies. Where this "fails" is for large files that have received small changes. The directory containing my main IMAP account, for example

Re: LVM snapshots vs. --link-dest

2009-09-28 Thread Paul Slootman
On Mon 28 Sep 2009, Andrew Gideon wrote: > > The --update option is also useful in this regard? What would happen if > --inplace were used but --update were not? --update only influences what files are considered for transfer, not how that transfer is performed; hence it is completely irrelevan

Re: LVM snapshots vs. --link-dest

2009-09-28 Thread Andrew Gideon
On Sun, 27 Sep 2009 17:14:42 +, Andrew Gideon wrote: > I was thinking that an alternative to links, which do nothing to > preserve space when small file changes have been made, would be using > LVM snapshots. Instead of creating a new directory for a new backup, > and specifying --link-dest t

Re: LVM snapshots vs. --link-dest

2009-09-27 Thread Andrew Gideon
On Sun, 27 Sep 2009 17:14:42 +, Andrew Gideon wrote: > Where this "fails" is for large files that have received small changes. > The directory containing my main IMAP account, for example, typically > generates between 1 and 2 G of daily backup data as I file messages in > my inbox. Yesterda

LVM snapshots vs. --link-dest

2009-09-27 Thread Andrew Gideon
I currently do incremental backups using --link-dest. Unchanged files are hard links to the previous snapshot; changed files are new copies. Where this "fails" is for large files that have received small changes. The directory containing my main IMAP account, for example, typically generates