[Unionfs] HD pool with UnionFS

[Josef 'Jeff' Sipek]

On Sun, Dec 28, 2008 at 01:24:16PM +0100, Florian Lindner wrote:
...
> The distribution is Debian Lenny. The recommondation from various  
> mailing list are to use a LVM but AFAIK it's not suitable for that.  

LVM is the way to go. I'll let you do everything you listed above.

> Recently I got a hint to use UnionFS for that purpose.

This might have changed since I left the project (however, I doubt it), but
Unionfs unifies ONLY namespace. It does not unify the disk space itself. For
example, if the left most branch fills up, creating new files will fail with
"not enough space". This may be ok if the files are mostly-read only, and if
you can manually place them across the branches. From what you describe, it
sounds like it'll be a rather frequently changing set of files.

I'd go with LVM, it was designed exactly for scenarios like you describe.

Josef 'Jeff' Sipek.

-- 
Fact: 25.8% of all statistics are generated randomly.