[Users] snapshot taken while live VM operates cause unresponsive hypervisor behavior

[Shu Ming]

The libvirt and qemu version in the VDSM host may help the debugging.
Alexandru Vladulescu:
>
> Hi,
>
>
> Using 3.1.0-3.19 from dreyou's repo on Centos 6.3 version, running 
> multiple VM on the hypervisor node and attempting to take a snapshot 
> from one of the running VMs generates errors for VDSM daemon as show 
> below:
> /
> //[root at hyper02 ~]# vdsClient -s 0 list//
> //Traceback (most recent call last)://
> //  File "/usr/share/vdsm/vdsClient.py", line 2275, in <module>//
> //    code, message = commands[command][0](commandArgs)//
> //  File "/usr/share/vdsm/vdsClient.py", line 280, in do_list//
> //    response = self.s.list(True, vms)//
> //  File "/usr/lib64/python2.6/xmlrpclib.py", line 1199, in __call__//
> //    return self.__send(self.__name, args)//
> //  File "/usr/lib64/python2.6/xmlrpclib.py", line 1489, in __request//
> //    verbose=self.__verbose//
> //  File "/usr/lib64/python2.6/xmlrpclib.py", line 1253, in request//
> //    return self._parse_response(h.getfile(), sock)//
> //  File "/usr/lib64/python2.6/xmlrpclib.py", line 1392, in 
> _parse_response//
> //    return u.close()//
> //  File "/usr/lib64/python2.6/xmlrpclib.py", line 838, in close//
> //    raise Fault(**self._stack[0])//
> //Fault: <Fault 1: "<type 'exceptions.TypeError'>:cannot marshal None 
> unless allow_none is enabled">/
>
>
> Paste from ovirt admin GUI log:
>
> /2013-Feb-07, 15:29:59 VM ipa01 is down. Exit message: User shut down//
> //2013-Feb-07, 15:29:34 Migration failed due to Error: Fatal error 
> during migration (VM: ipa01, Source Host: Hyper02).//
> //2013-Feb-07, 15:29:32 Starting migration of VM ipa01 from Host 
> Hyper02 to Host Hyper01 (User: admin at internal.).//
> //2013-Feb-07, 15:29:10 Migration failed due to Error: Fatal error 
> during migration (VM: ipa01, Source Host: Hyper02).//
> //2013-Feb-07, 15:29:10 Migration failed due to Error: Fatal error 
> during migration (VM: ipa01, Source Host: Hyper02). Trying to migrate 
> to another Host.//
> //2013-Feb-07, 15:29:08 Starting migration of VM ipa01 from Host 
> Hyper02 to Host Hyper01 (User: admin at internal.).//
> //2013-Feb-07, 15:24:58 Detected new Host Hyper02. Host state was set 
> to Up.//
> //2013-Feb-07, 15:24:53 Host Hyper02 is initializing. Message: 
> Recovering from crash or Initializing//
> //2013-Feb-07, 15:22:18 VM ipa01 was resumed by admin at internal (Host: 
> Hyper02).//
> //2013-Feb-07, 15:22:18 VM ipa01 was resumed by admin at internal (Host: 
> Hyper02).//
> //2013-Feb-07, 15:20:43 Snapshot [initial installation][after ipa 
> server installation] creation for VM ipa01 has been completed.//
> //2013-Feb-07, 15:20:43 VM ipa01 has paused due to unknown storage error./
>
> Looking through htop command could see that VM were still running and 
> responsive but any vdsclient command failed with the upper code paste 
> I have given. Solution here was to connect to each VM, shut it down 
> and restart vdsmd and power it up again. There's no problem with the 
> storage size as it has aprox 800GB free of space and running through 
> NFS. All nfs mount points were running okay at that time.
>
> After the VM has been snapshoot-ed went into pause mode and had to 
> un-pause it from GUI, but the VM was still responsive through network 
> and operations.
>
> Has anybody seen something related to this by now or it's just related 
> to 3.1 version ? Mentioning the fact that I did a research on the 
> similar mailing list topics and could not find something related to 
> this error. I would happily provide logs if needed.
>
>
> Regards,
> Alex
>
>
> _______________________________________________
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> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users


-- 
---
?? Shu Ming
Open Virtualization Engineerning; CSTL, IBM Corp.
Tel: 86-10-82451626  Tieline: 9051626 E-mail: shuming at cn.ibm.com or shuming at linux.vnet.ibm.com
Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC

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