Re: Copy/move btrfs volume

2010-07-21 Thread Hubert Kario
On Saturday 03 July 2010 09:33:19 Lubos Kolouch wrote: > Oystein Viggen, Fri, 02 Jul 2010 08:15:03 +0200: > > For btrfs with lots of snapshots, I believe "btrfs device add" of the > > new device followed by "btrfs device remove" of the old one would be the > > most convenient. > > > > Øystein > >

Re: Copy/move btrfs volume

2010-07-03 Thread Lubos Kolouch
Oystein Viggen, Fri, 02 Jul 2010 08:15:03 +0200: > For btrfs with lots of snapshots, I believe "btrfs device add" of the > new device followed by "btrfs device remove" of the old one would be the > most convenient. > > Øystein This solution if very elegant and cool - if you can put the discs int

Re: Copy/move btrfs volume

2010-07-01 Thread Oystein Viggen
* [Matt Brown] > With backed up files consisting of hard links, I usually use dd to copy > the file systems at the block level > > # dd if=/dev/sda of=/dev/sdb bs=20M > > and then expand the file system. This is because I found that tools like > rsync, while usually fast, are extremely slow when

Re: Copy/move btrfs volume

2010-07-01 Thread Chris Mason
On Thu, Jul 01, 2010 at 11:33:59AM +, Lubos Kolouch wrote: > Daniel J Blueman, Thu, 01 Jul 2010 12:26:10 +0100: > >> What is the correct way to do this? > > > > The only way to do this preserving duplication is to use hardlinks > > between duplicated files (which reference counts the inode), a

Re: Copy/move btrfs volume

2010-07-01 Thread Matt Brown
On 07/01/2010 05:33 AM, Lubos Kolouch wrote: > Daniel J Blueman, Thu, 01 Jul 2010 12:26:10 +0100: >>> What is the correct way to do this? >> >> The only way to do this preserving duplication is to use hardlinks >> between duplicated files (which reference counts the inode), and use >> 'rsync -H'. >

Re: Copy/move btrfs volume

2010-07-01 Thread Lubos Kolouch
Daniel J Blueman, Thu, 01 Jul 2010 12:26:10 +0100: >> What is the correct way to do this? > > The only way to do this preserving duplication is to use hardlinks > between duplicated files (which reference counts the inode), and use > 'rsync -H'. > > Dan But when the files are on different snapho

Re: Copy/move btrfs volume

2010-07-01 Thread Daniel J Blueman
On 1 July 2010 11:28, Lubos Kolouch wrote: > Hello, > > I am testing btrfs on one of our backup servers > (many millions of files, 1.5TB size, running on (non-btrfs-provided-) > raid5). > > I am using subvolumes/snapshots with following rsync. > > It works very well, but I would like to ask a ques