Re: Re: Xen breaking iSCSI

[Niraj Tolia <ntolia@gmail.com>]

On Thu, 12 Aug 2004 11:15:26 +0100, Ian Pratt <ian.pratt@cl.cam.ac.uk> wrote:
> > On Mon, 09 Aug 2004 15:14:56 +0100, Keir Fraser
> > <keir.fraser@cl.cam.ac.uk> wrote:
> > >
> > > Well, I guess it sounds like a merging problem, so it could be that or
> > > a bug in the backend driver that crept in while merging with the 2.6
> > > driver.
> > >
> > > We'll need to be able to reproduce it ourselves, or get more
> > > information by other means. e.g., see if you can track down the bug by
> > > addign tracing to the drivers, or try a repository from a week or two
> > > ago and see if it has the same problem.
> > >
> >
> > Traced the bug down to a single changeset. It occurs with this
> > changeset and after but not before it. I should note that I am using a
> > xen0 kernel in dom.
> >
> > ChangeSet@1.1108.17.1, 2004-07-26 16:09:53+01:00, kaf24@scramble.cl.cam.ac.uk
> >   A better fix for blkdev request merging. Should work for both IDE and
> >   SCSI, and do as much merging as possible, and also no need for PIO
> >   fallback mode.
> >
> > Let me know if you need any other information.
> 
> I suspect this will turn out to be a bug in the iscsi code...
> 
> Can you access the iscsi block device within domain 0 OK? Is it
> only when you export it to another domain that there's a problem?

That is correct. All accesses within dom0 are ok. Its only when its
exported to and used from another domain that I see the problems.

> 
> Have you tried using the 2.6 kernel and iscsi-4.0.1 driver?
> 

I have not done that yet. I will try to give it a shot. I am assuming
you are talking about 2.6 within Xen.

Niraj


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