[Fedora-livecd-list] RFC- unionfs persistence?

[Douglas McClendon]

While I haven't by any means given up pursuit of my devicemapper 
implementation of persistence, I wonder-

What do people think about using unionfs for persistence (and perhaps 
Copy-On-Write in general) in Fedora LiveCDs?

I was somewhat surprised to discover a while back that ubuntu actually 
used devicemapper for their COW long ago (early 2005).  But that they 
abandoned that in favor of the 'flexibility' of unionfs.

I know that unionfs was ruled out as an option for Fedora, because it 
was being kept out of the repos.  In fact, before pilgrim/livecd-creator 
came into existence, I posted a proof of concept fedora unionfs-based 
livecd infrastructure-

http://www.redhat.com/archives/fedora-livecd-list/2006-April/msg00197.html

But a lot has changed in the last 18 months.  It seems that unionfs is 
in the -mm kernel tree, and between that, fuse-unionfs, and aufs, it 
seems pretty likely that some flavor of unionfs will make it into fedora 
in the foreseeable future.

Given that, and given the multitude of other projects I could be working 
on, makes me wonder how much time I should spend working on devicemapper 
persistence, if the vast majority of livecds out there are using 
unionfs, and unionfs may become an option for fedora in the near future.

Comments?

Thanks,

-dmc