[sheepdog] [PATCH] sheep: exit when version of QEMU is old

[MORITA Kazutaka]

At Thu, 28 Feb 2013 20:58:58 +0900,
Hitoshi Mitake wrote:
> 
> At Thu, 28 Feb 2013 20:31:25 +0900,
> MORITA Kazutaka wrote:
> > 
> > At Thu, 28 Feb 2013 19:59:07 +0900,
> > Hitoshi Mitake wrote:
> > > 
> > > I encountered a problem which might be caused by a combination of old
> > > QEMU and latest sheepdog. Suddenly qemu reported I/O errors and
> > > objects of sheeps seemed to be broken. In the log message, I could
> > > find the message "Some VDI faild to release the object cache. Probably
> > > you are running old QEMU." So I updated my QEMU and the problem seemed
> > > to be solved.
> > > 
> > > I'm not sure the real source of the problem was the version
> > > mismatch. But from a perspective of administration, I believe that
> > > sheep should exit in such a case.
> > 
> > In such cases, killing sheep is not a good idea at all.  If there is a
> > problem in the older version of QEMU, incrementing SD_PROTO_VER and
> > checking the protocol version in request headers are the correct way
> > to go, I think.
> > 
> > But, is there really such a problem in the older QEMU?  What version
> > of QEMU are you using?
> > 
> 
> The version of QEMU we used is 1.2.50.

QEMU uses the number in the development phase between 1.2 and 1.3.
What is the commit hash value you tested?

Thanks,

Kazutaka