On 01/06/11 19:35, Hugo Mills wrote: > On Thu, Jan 06, 2011 at 05:36:48PM +0100, Ivan Labáth wrote: >> Is there a reason one can not mount a btrfs and it's byte-for-byte >> copy in parallel, or is the driver just acting silly? > > Probably because both filesystems have identical UUIDs (and labels) > and so will (I suspect) end up being identified as the same filesystem > by the btrfs code. > > Hugo. >
The reason I ask is, that I had a mirror RAID (btrfs on LVM on LUKS on RAID) across 2 disks. Then I snatched one to take with me when going away for holidays, copied some files on to it and when I came back, I wanted to get to those files. The problem was, I couldn't mount the fs I took with me, because a similar fs was already mounted. As it wasn't the root fs, I could unmount it and copy the files on some other fs (though one could use pivot_root, if it was the root fs). It seems to me there are cases, where one would want to mount two copies of originally the same filesystem - think of RAID, VMs, distributing fs images on a network, LVM snapshots, backups, etc. -- ivan -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
