Re: btrfs userspace question - where's the utility to dump/restore?
On Thu, 17 Jan 2013 22:18:19 +, Hugo Mills said: > On Thu, Jan 17, 2013 at 03:05:35PM -0500, Valdis Kletnieks wrote: > > So I'm looking at playing with btrfs, and I start looking at the > > userspace pieces I'll need. What I can't find is an equivalent > > of the ext[34] "dump/restore" package to dump data to an external > > backup device. Is 'tar cf --acls --selinux --xattrs /external/fs.dump' > > as good as it gets, or is something else recommended? > >tar doesn't handle reflinks(+), so the above won't quite give you a > complete duplicate. In the btrfs tool, there's send/receive, which > should(*) be sufficient to deal with reflinks. So I decided to try it out on the filesystem that I stash all my music (mostly because I can survive without that filesystem if I trash it, and I have a known good backup). Apparently, send/receive isn't in the manpage, which is why I didn't see it. Fortunately, there's --help [~] btrfs send --help usage: btrfs send btrfs send [-v] [-i ] [-p ] Send the subvolume to stdout. [~] btrfs send -v /mp3 > /disk2/backups/mp3.btrfs ERROR: /mp3 is not read-only. [~] mount -o remount,ro /mp3 [~] btrfs send -v /mp3 >| /disk2/backups/mp3.btrfs ERROR: /mp3 is not read-only. Bah. Obviously this isn't anywhere near as easy as it is for ext4. /me wanders off to find more caffeine... pgp3mpfmuo5PP.pgp Description: PGP signature
Re: btrfs userspace question - where's the utility to dump/restore?
On Thu, 17 Jan 2013 22:18:19 +, Hugo Mills said: On Thu, Jan 17, 2013 at 03:05:35PM -0500, Valdis Kletnieks wrote: So I'm looking at playing with btrfs, and I start looking at the userspace pieces I'll need. What I can't find is an equivalent of the ext[34] dump/restore package to dump data to an external backup device. Is 'tar cf --acls --selinux --xattrs /external/fs.dump' as good as it gets, or is something else recommended? tar doesn't handle reflinks(+), so the above won't quite give you a complete duplicate. In the btrfs tool, there's send/receive, which should(*) be sufficient to deal with reflinks. So I decided to try it out on the filesystem that I stash all my music (mostly because I can survive without that filesystem if I trash it, and I have a known good backup). Apparently, send/receive isn't in the manpage, which is why I didn't see it. Fortunately, there's --help [~] btrfs send --help usage: btrfs send command args btrfs send [-v] [-i subvol] [-p parent] subvol Send the subvolume to stdout. [~] btrfs send -v /mp3 /disk2/backups/mp3.btrfs ERROR: /mp3 is not read-only. [~] mount -o remount,ro /mp3 [~] btrfs send -v /mp3 | /disk2/backups/mp3.btrfs ERROR: /mp3 is not read-only. Bah. Obviously this isn't anywhere near as easy as it is for ext4. /me wanders off to find more caffeine... pgp3mpfmuo5PP.pgp Description: PGP signature
Re: btrfs userspace question - where's the utility to dump/restore?
On Thu, Jan 17, 2013 at 03:05:35PM -0500, Valdis Kletnieks wrote: > So I'm looking at playing with btrfs, and I start looking at the > userspace pieces I'll need. What I can't find is an equivalent > of the ext[34] "dump/restore" package to dump data to an external > backup device. Is 'tar cf --acls --selinux --xattrs /external/fs.dump' > as good as it gets, or is something else recommended? tar doesn't handle reflinks(+), so the above won't quite give you a complete duplicate. In the btrfs tool, there's send/receive, which should(*) be sufficient to deal with reflinks. Hugo. (+) aka CoW copies, or snapshots (*) I regret to say that I've not had the opportunity to play with send/receive myself yet, so I can't advise on the details of making it work yet. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Prisoner unknown: Return to Zenda. --- signature.asc Description: Digital signature
btrfs userspace question - where's the utility to dump/restore?
So I'm looking at playing with btrfs, and I start looking at the userspace pieces I'll need. What I can't find is an equivalent of the ext[34] "dump/restore" package to dump data to an external backup device. Is 'tar cf --acls --selinux --xattrs /external/fs.dump' as good as it gets, or is something else recommended? pgpE2slZ4UrO1.pgp Description: PGP signature
btrfs userspace question - where's the utility to dump/restore?
So I'm looking at playing with btrfs, and I start looking at the userspace pieces I'll need. What I can't find is an equivalent of the ext[34] dump/restore package to dump data to an external backup device. Is 'tar cf --acls --selinux --xattrs /external/fs.dump' as good as it gets, or is something else recommended? pgpE2slZ4UrO1.pgp Description: PGP signature
Re: btrfs userspace question - where's the utility to dump/restore?
On Thu, Jan 17, 2013 at 03:05:35PM -0500, Valdis Kletnieks wrote: So I'm looking at playing with btrfs, and I start looking at the userspace pieces I'll need. What I can't find is an equivalent of the ext[34] dump/restore package to dump data to an external backup device. Is 'tar cf --acls --selinux --xattrs /external/fs.dump' as good as it gets, or is something else recommended? tar doesn't handle reflinks(+), so the above won't quite give you a complete duplicate. In the btrfs tool, there's send/receive, which should(*) be sufficient to deal with reflinks. Hugo. (+) aka CoW copies, or snapshots (*) I regret to say that I've not had the opportunity to play with send/receive myself yet, so I can't advise on the details of making it work yet. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Prisoner unknown: Return to Zenda. --- signature.asc Description: Digital signature
