[Devel] RE: storage considerations

[Dietmar Maurer]

> >>> Dietmar Maurer wrote:
> >>>
> >>>> Hi Daniel,
> >>>>
> >>>> I think we should have several options for the root storage:
> >>>>
> >>>> 1.) simply use the host filesystem (like Openvz)
> >>>>
> >>>> 	- special quota support is needed (simfs?)
> >>>>
> >>>> 	- quota support depends on ext3 fs, so this only works for
> >>>> 	  local attached storage (does not work on NFS)
> >>>>
> >>>> 	- LVM snapshots are slow, because the snapshot includes all
> >>>> container
> >>>> 	  on that filesystem.
> >>>>
> >> I'm looking forward to the btrfs, tux3, and nilfs snapshotting
> >> capabilities.
> >>
> > Interesting, especially the nilfs.
> > The COW file systems is missing in the linux kernel. Do you think
the
> > btrfs has a chance to go to mainline ?
> 
> We've been using NILFS (v1) for 2 years already with Zap, and it works
> quite well. We had to make slight (trivial) changes to be able to
> control it nicely for c/r purposes.

NILFS, BTRFS, ... maybe provide solution for snapshots, but quota
support
is still missing (we need quotas on subdirectories)?

And a FS independent solution would be great, so that it works on top of
NFS too. 

So UnionFS looks good, but it does not provide real snapshots (using 
base + incremental change looks clumsy for our purpose). I am also not
sure
if quota works on UnionFS?

- Dietmar

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