linux-kernel - Re: btrfs userspace question - where's the utility to dump/restore?

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Message-ID: <20130117221819.GA5406@carfax.org.uk>
Date:	Thu, 17 Jan 2013 22:18:19 +0000
From:	Hugo Mills <hugo-lkml@...fax.org.uk>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:	linux-kernel@...r.kernel.org
Subject: 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.

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