On Thu, Apr 07, 2005 at 02:49:39PM +0100, Ian Jackson wrote:
> Patrick Caulfield writes ("Re: Bug#303423: LVM has annoying 110% restriction
> on snapshot LV size"):
> > There's no point in creating a snapshot any bigger! The COW
> > mechanism copies blocks from the original device into the snapshot
> > as they get changed, but once it's copied all the blocks once there
> > is nothing else to use the space. the 100% restriction is just there
> > to stop you wasting disk space. the 10% extra is to cover metadata.
>
> Indeed, that's the explanation I expected.
>
> But (a) it's undocumented and
So little of LVM is documented anyway that's hardly surprising
> (b) 10% is an arbitrary fudge factor and
Probably so. but it's probably near enough. I haven't talked to Heinz about this
but I doubt he just plucked the number out of the air so I suppose it's based on
some rough idea of the metadata size.
> (c) making it a fatal error makes it hard to write scripts reliably.
> The limit should be documented and either silently enforced or turned
> into a warning. Furthermore, the error message should be improved.
There is no development happening on LVM1 now. It has all been dropped in favour
of LVM2 I'm afraid.
--
patrick
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