Re: [Xen-users] "xm save" only works once...

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Steven Hand wrote:

> > I am using Xen-2.0.7 on a Dual Intel Xeon 2.8GHz system with 4GB of ram. I am 
> > using 2.6.11 as kernel for my domain 0. Domain 0 uses Debian Sarge with a 
> > backported Xen 2.0.7 package (only litte changes to the debian 2.0.6 package, 
> > nothing important enough to get metioned). All kernels were compiled against 
> > vanilla kernels with xen-patch. The domain U's are using 2.6.11 or 2.4.30 
> > (debian, suse).
> > I have no problems within domains and everything is running very smoothly, 
> > exepct one thing (which was also not working correctly in xen-2.0.6 for me):
> > I can save a domain with "xm save <domainname> <suspendfile>" once and I can 
> > restore this domain again, but if I try a second "xm save ..." it simply 
> > seems to hang. Nothing happens and the last thing in the logs are these 
> > lines:
> >    
> Is this the same with both 2.4 and 2.6 domUs? I've noticed something similar 
> with 2.0.7 but only with 2.4 domUs ... it would be useful to know if it 
> affects 2.6 also - I'm trying to track it down. 
>  
There's a very similiar problem in 3.0 that has to do with a race 
condition with the xc_save/Xend interaction.  xc_save thinks it has sent 
the "suspend" command over the pipe and Xend is waiting for it to arrive.
xc_save wasn't back-ported to 2.0.7 right?  Looking into it right now.

Regards,

Anthony Liguori

> cheers,
>
> S.
>
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