RE: [Xen-devel] AFS-based VBD backend

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

 > > The blocktap backend driver is what you want. I'm not sure of it's 
> > current state, but the plan is to enable you to terminate a 
> blk device 
> > channel in user-space.
> 
> Cool!  Where was the most recent version of that?

Unstable tree, but probably works in 2.0 too.

> > Of course, you could use 'unfsd -r' and export your AFS root file 
> > systems via same-machine NFS. This works pretty well, but I 
> can't say 
> > I've hammered it.
> 
> I'm one of the folks who ran into the NFS root hangs early on 
> -- trying very hard to get off of it, hence this messing 
> about with alternatives.
> Granted, I'm not using same-machine NFS, don't know how much 
> that would reduce the hangs.

Do you still see hangs with 2.6.9 kernels?

> One variation on that theme that I have tested is an enbd 
> server running on an AFS client, serving block devices to 
> dom0 on another machine.  ;-) Slow, but seems stable.  
> Haven't tried same-machine with that either, because it eats 
> about 30% CPU on the enbd server under load.

We use redhat gnbd in preference to enbd.

Ian 


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