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 (b) 10% is an arbitrary fudge factor and
(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.
Ian.
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