[Libguestfs] virt-v2v import from KVM without storage-pool ?

[Ming Xie]

I could reproduce customer's problem

Packages:
rhv:4.1.3-0.1.el7
vdsm-4.19.20-1.el7ev.x86_64
virt-v2v-1.36.3-6.el7.x86_64
libguestfs-1.36.3-6.el7.x86_64

Steps:
1.Prepare a guest which is not listed storage pool
# virsh dumpxml avocado-vt-vm1
....
   <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/root/RHEL-7.3-x86_64-latest.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </disk>
.....
2.Try to import this guest in rhv4.1 from KVM host but failed to import the guest and get error info from vdsm.log
....
2017-07-07 14:41:22,176+0800 ERROR (jsonrpc/6) [root] Error getting disk size (v2v:1089)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/v2v.py", line 1078, in _get_disk_info
    vol = conn.storageVolLookupByPath(disk['alias'])
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 4555, in storageVolLookupByPath
    if ret is None:raise libvirtError('virStorageVolLookupByPath() failed', conn=self)
libvirtError: Storage volume not found: no storage vol with matching path '/root/RHEL-7.3-x86_64-latest.qcow2'
....


3.Try to convert this guest to rhv by virt-v2v on v2v conversion server,could import the guest from export domain to data domain on rhv4.1 after finishing conversion
# virt-v2v avocado-vt-vm1 -o rhv -os 10.73.131.93:/home/nfs_export
[   0.0] Opening the source -i libvirt avocado-vt-vm1
[   0.0] Creating an overlay to protect the source from being modified
[   0.4] Initializing the target -o rhv -os 10.73.131.93:/home/nfs_export
[   0.7] Opening the overlay
[   6.1] Inspecting the overlay
[  13.8] Checking for sufficient free disk space in the guest
[  13.8] Estimating space required on target for each disk
[  13.8] Converting Red Hat Enterprise Linux Server 7.3 (Maipo) to run on KVM
virt-v2v: This guest has virtio drivers installed.
[  52.2] Mapping filesystem data to avoid copying unused and blank areas
[  52.4] Closing the overlay
[  52.7] Checking if the guest needs BIOS or UEFI to boot
[  52.7] Assigning disks to buses
[  52.7] Copying disk 1/1 to /tmp/v2v.Zzc4KD/c9cfeba7-73f8-428a-aa77-9a2a1acf0063/images/c8eb039e-3007-4e08-9580-c49da8b73d55/f76d16ea-5e66-4987-a496-8f378b127986 (qcow2)
    (100.00/100%)
[ 152.4] Creating output metadata
[ 152.6] Finishing off


Result:
So this problem is caused by vdsm or ovirt

Regards
Ming Xie

----- Original Message -----
From: "Richard W.M. Jones" <rjones at redhat.com>
To: "Matthias Leopold" <matthias.leopold at meduniwien.ac.at>
Cc: users at ovirt.org, libguestfs at redhat.com
Sent: Wednesday, July 5, 2017 9:15:16 PM
Subject: Re: [Libguestfs] virt-v2v import from KVM without storage-pool ?

On Wed, Jul 05, 2017 at 11:14:09AM +0200, Matthias Leopold wrote:
> hi,
> 
> i'm trying to import a VM in oVirt from a KVM host that doesn't use
> storage pools. this fails with the following message in
> /var/log/vdsm/vdsm.log:
> 
> 2017-07-05 09:34:20,513+0200 ERROR (jsonrpc/5) [root] Error getting
> disk size (v2v:1089)
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/site-packages/vdsm/v2v.py", line 1078, in
> _get_disk_info
>     vol = conn.storageVolLookupByPath(disk['alias'])
>   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 4770,
> in storageVolLookupByPath
>     if ret is None:raise libvirtError('virStorageVolLookupByPath()
> failed', conn=self)
> libvirtError: Storage volume not found: no storage vol with matching path
> 
> the disks in the origin VM are defined as
> 
>     <disk type='file' device='disk'>
>       <driver name='qemu' type='raw' cache='writethrough'/>
>       <source file='/dev/kvm108/kvm108_img'/>
> 
>     <disk type='file' device='cdrom'>
>       <driver name='qemu' type='raw'/>
>       <source file='/some/path/CentOS-7-x86_64-Minimal-1611.iso'/>
> 
> is this a virt-v2v or oVirt problem?

Well the stack trace is in the oVirt code, so I guess it's an oVirt
problem.  Adding ovirt-users mailing list.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/

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