[Xen-users] Re: cow implementation

[Charles Duffy <cduffy@xxxxxxxxxxx>]

Molle Bestefich wrote:
> Are you going to do performance tests?
>
> Finding out which one of UnionFS, cowloop and minifo:
> http://www.denx.de/wiki/bin/view/Know/MiniFOHome
>
> is the best performer would be very relevant when running multiple
> instances in virtual machines!
Finding out which one is actually *stable* would be interesting enough 
for me.
UnionFS is not enough of a lookalike to be reliably used as a root 
filesystem: /proc/<pid>/exe links point to the underlying filesystems 
(breaking several distributions' tools for checking daemons' status); 
there's funkiness with mmap; and it's quite crash-prone. Granted, I'm 
trying to run a full SuSE image with Oracle on top, so I'm perhaps 
demanding more than some users might -- but in my case, UnionFS is 
simply not stable enough... yet. There's progress being made, though, 
and I'm watching the list.
mini_fo looks interesting; I'll give that a try.


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