Xen users - May 2005 - xm save while VM is writing once per second?

I must not be understanding something trivial that I cannot
find in the documentation.

I am running Xen 2.0.5 with Fedora Core 3 successfully.

I have a VM (VM4) running a test shell script that loops
infinitely while writing the date and a counter every
second (to /tmp/counter).

The entire VM is using a file-backed VBD for all storage
(/vm-images/vm-4-disk acting as sda1 to the VM).

Running ''xm save VM4 /vm-images/vm4.save'' from dom0
never returns (well, I have been staring at it for 5
minutes now).

''xm save VM4 /vm-images/vm4.save'' works fine without the
looping script writing to /tmp/counter every second.

Somebody clue me in?


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Do you have logs of this?  It''s probably worthwhile to open this as a 
bug in Bugzilla (if you could provide the script too that''d be
excellent).

Regards,

Anthony Liguori

Jeff Blaine wrote:
> I must not be understanding something trivial that I cannot
> find in the documentation.
>
> I am running Xen 2.0.5 with Fedora Core 3 successfully.
>
> I have a VM (VM4) running a test shell script that loops
> infinitely while writing the date and a counter every
> second (to /tmp/counter).
>
> The entire VM is using a file-backed VBD for all storage
> (/vm-images/vm-4-disk acting as sda1 to the VM).
>
> Running ''xm save VM4 /vm-images/vm4.save'' from dom0
> never returns (well, I have been staring at it for 5
> minutes now).
>
> ''xm save VM4 /vm-images/vm4.save'' works fine without the
> looping script writing to /tmp/counter every second.
>
> Somebody clue me in?
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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On Tue, 2005-05-10 at 15:04 -0400, Jeff Blaine wrote:
> I must not be understanding something trivial that I cannot
> find in the documentation.
> 
> I am running Xen 2.0.5 with Fedora Core 3 successfully.
> 
> I have a VM (VM4) running a test shell script that loops
> infinitely while writing the date and a counter every
> second (to /tmp/counter).
> 
> The entire VM is using a file-backed VBD for all storage
> (/vm-images/vm-4-disk acting as sda1 to the VM).
> 
> Running ''xm save VM4 /vm-images/vm4.save'' from dom0
> never returns (well, I have been staring at it for 5
> minutes now).
> 
> ''xm save VM4 /vm-images/vm4.save'' works fine without the
> looping script writing to /tmp/counter every second.
> 
> Somebody clue me in?

This may sound odd, but have you run the save command a second time
after the first time never returned? I have a similar configuration as
you and I just ran xm save command. The first time, it just sat there
and didn''t return. I exited it and ran the command again and it worked.

I''m still figuring out why. But it worked the second time I ran the xm
save command.

I followed up the save with "xm restore" and that worked.

Thanks,

Dan




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> > I am running Xen 2.0.5 with Fedora Core 3 successfully.
> > 
> > I have a VM (VM4) running a test shell script that loops infinitely 
> > while writing the date and a counter every second (to /tmp/counter).
> > 
> > The entire VM is using a file-backed VBD for all storage 
> > (/vm-images/vm-4-disk acting as sda1 to the VM).
> > 
> > Running ''xm save VM4 /vm-images/vm4.save'' from dom0
never returns
> > (well, I have been staring at it for 5 minutes now).
> > 
> > ''xm save VM4 /vm-images/vm4.save'' works fine without
the looping
> > script writing to /tmp/counter every second.
> > 
> > Somebody clue me in?
There are a bunch of fixes in this area in 2.0-testing. I want to fix
two other bugs and then do a 2.0.6 release next week.

Ian

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