[linux-lvm] LVM snapshots overflow due to initial "overhead"?

J. Javier Maestro jjmaestro at ieee.org
Sun Nov 30 18:19:42 UTC 2008

On Nov Sun 30 2008 16:37, Alasdair G Kergon wrote:
> On Sun, Nov 30, 2008 at 05:06:48PM +0100, J. Javier Maestro wrote:
> > http://www.tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html
> >     **If the snapshot size equals the origin size, it will never overflow.**
> That's simply inaccurate and should be corrected.

I agree with you, but it would be much more interesting to see why it is
incorrect. I mean, as I mentioned in my email, why are those chunks used
upfront?  By doing that, the whole nice idea of a snapshot breaks completely.
It would be much, much better to account for that and move those chunks out
of the snapshot.

: :'  :   J. Javier Maestro
`. `'`   <jjmaestro at ieee.org>

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