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Re: [fedora-virt] info on save function in virt-manager



On Thu, Sep 24, 2009 at 5:42 PM, gianluca.cecchi <gianluca cecchi gmail com> wrote:
On Tue, Sep 22, 2009 at 3:00 PM, Mark McLoughlin <markmc redhat com> wrote:
On Tue, 2009-09-22 at 10:05 +0200, Gianluca Cecchi wrote:
> > Yeah, I think there's a bug currently in the code.  I believe markmc
> has
> > recently ported that patch back, though, so upgrading to a newer
> version
> > (when
> > he pushes it) should fix the bug.
> >
> > --
> > Chris Lalancette
> >
>
> OK, I'll wait for the fix and then I test.

I think the fix Chris means is in libvirt-0.7.1-5

Cheers,
Mark.

I confirm that with that version of libvirt I'm able to save my VM (or at least the command completes, not tried yet to restore '-)
Inside the data file saved I can see that there is also the xml config for the guest embedded ....
As the VM is killed at the end of the save, can I then
- copy the disk(s) of the VM to another host
- copy the save file to another host
- restore the save on that secondary host based on the fact that it retains the same config?

At this time, trying to restore on another host that has not the same storage poool config gives this:
Error restoring domain '/mnt/rhel54_x86_64': internal error unable to start guest: qemu: could not open disk image /dev/vg_qemu01/rhel53_64

and in details window:
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/manager.py", line 458, in restore_saved_callback
    newconn.restore(file_to_load)
  File "/usr/share/virt-manager/virtManager/connection.py", line 642, in restore
    self.vmm.restore(frm)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 1420, in restore
    if ret == -1: raise libvirtError ('virDomainRestore() failed', conn=self)
libvirtError: internal error unable to start guest: qemu: could not open disk image /dev/vg_qemu01/rhel53_64

Supposing I recreate a pool with the same pointers and the hard disk of the VM, are there other limitations/restrictions to restore on another host?


BTW: the restore on the same host (with the VM still stopped as at the end of the save), doesn't work either. I get:
Error restoring domain '/mnt/rhel54_240909_1750.save': Unable to read QEMU help output: Interrupted system call

And inside the details window:
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/manager.py", line 458, in restore_saved_callback
    newconn.restore(file_to_load)
  File "/usr/share/virt-manager/virtManager/connection.py", line 642, in restore
    self.vmm.restore(frm)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 1420, in restore
    if ret == -1: raise libvirtError ('virDomainRestore() failed', conn=self)
libvirtError: Unable to read QEMU help output: Interrupted system call

[root virtfedbis qemu]# ll /mnt/rhel54_240909_1750.save
-rw------- 1 root root 334221504 2009-09-24 17:51 /mnt/rhel54_240909_1750.save

The VM has an hd of 8Gb of size and 4Gb of ram.

If I want to debug setting LIBVIRTD_DEBUG=1 and then run the restore command via command line, what would it be, so that I can bugzilla this (if not already there)?

Inside /var/log/messages I have this:
Sep 24 17:51:51 virtfedbis kernel: libvirtd[25820]: segfault at 0 ip 00000039762a4822 sp 00007f20a7546880 error 4 in libc-2.10.1.so[3976200000+164000]
Sep 24 17:51:51 virtfedbis libvirtd: 17:51:51.379: error : qemudExtractVersionInfo:1032 : Unable to read QEMU help output: Interrupted system call

In virt-manager.log I have the same messages as in the virt-manager window.
My packages releases are:
kernel 2.6.30.5-43.fc11.x86_64
[root virtfedbis qemu]# rpm -qa libvirt* qemu*
qemu-system-x86-0.10.92-5.fc11.x86_64
qemu-img-0.10.92-5.fc11.x86_64
qemu-kvm-0.10.92-5.fc11.x86_64
libvirt-0.7.1-5.fc11.x86_64
libvirt-python-0.7.1-5.fc11.x86_64
libvirt-client-0.7.1-5.fc11.x86_64
qemu-common-0.10.92-5.fc11.x86_64

Thanks,
Gianluca


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