On Thu, Aug 27, 2015 at 11:53:28AM -0600, Chris Murphy wrote: > On Thu, Aug 27, 2015 at 11:32 AM, carlo von lynX > <lynX@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hi there. Excuse me if I didn't subscribe the list. Just wanted to > > let you know of this behavior assuming you haven't noticed it yet. > > > > When mounting two copies of the same file system from two different > > hard disks with the intention of syncing the older with the newer > > one, btrfs behaves differently from ext4: it will mount the first > > one twice rather than mounting each. I assume it has something to > > do with all UUIDs being identical, which doesn't disturb ext4 though. > > I'd say any file system that allows mount without warning when two fs > volumes with the same UUID is a bug. I vastly prefer the XFS behavior > in this regard which is warn and refusal to mount. You have to use -o > nouuid to make it happen; and then I guess there's some separate > handling to still keep the fs instances separate, but I don't know how > that works at all or how ext4 and Btrfs differ. See my other email in this thread. :) Hugo. -- Hugo Mills | You know... I'm sure this code would seem a lot hugo@... carfax.org.uk | better if I never tried running it. http://carfax.org.uk/ | PGP: E2AB1DE4 |
Attachment:
signature.asc
Description: Digital signature
