Re: [uml-user] Upgrading Disk Space

[Jeff D. <jd...@ad...>]

bo...@bl... said:
> But why are people so into using cow files in the first place? 

Because they save a lot of host memory.  Using COW, each page of the backing
file is present once in the host page cache (plus once for the page cache of
each UML using it).

Without COW, that would be one copy per UML (and again once per UML page
cache).

It also makes booting UMLs after the first one faster since the backing file
data is already in host memory and doesn't need to be copied from disk.

				Jeff