[Fedora-livecd-list] Anyone using the overlay file?

[Daire Byrne]

----- "Jeremy Katz" <katzj at redhat.com> wrote:

> Not usefully -- you can string together some 'dm table' commands and
> get the number of blocks used but it requires being root and also had
> some oddities.
> 
> My kingdom for an upstreamable unionfs :/

We use "aufs" to union a COW filesystem for our custom "Live" system. It does seem a little odd that many of the other distros now use a union filesystem approach to LiveCDs and NFS read-only roots but Fedora has for the time being stayed away from it. It's not like there isn't lots of custom stuff being put into fedora/redhat kernels that isn't yet upstream. In fact there was a discussion about getting UnionFS upstream recently on the kernel list....

Saying all this the dm-snapshot approach will be more efficient space wise as it works with blocks instead of whole files.

Daire