[Libguestfs] [ovirt-users] OVA import of FC21 VM hangs during virt-v2v conversion?

[Richard W.M. Jones]

On Wed, Nov 16, 2016 at 10:56:39AM -0500, Derek Atkins wrote:
> "Richard W.M. Jones" <rjones at redhat.com> writes:
> 
> > On Wed, Nov 16, 2016 at 09:06:29AM +0200, Michal Skrivanek wrote:
> >> 
> >> > On 7 Nov 2016, at 22:16, Derek Atkins <derek at ihtfp.com> wrote:
> >> > 
> >> > Hi,
> >> > 
> >> > My last VM imported in 2 minutes.  This one has been sitting for three
> >> > hours.  I think this is a bug.
> >> 
> >> well, some time it does take a long time. Are you sure it was hung?
> >> No I/O going on?
> >> 
> >> adding libguestfs list 
> >
> > The most likely reason for virt-v2v to hang (actually it's qemu which
> > is hanging) is that you've run out of disk space.  Most probably in
> > /var/tmp but best to check all your host filesystems.
> 
> No, the filesystem had plenty of space.
> 
> It eventually did complete, after several hours.  But I don't understand
> why this particular VM took so long when others (with similar disk
> sizes/usages/configurations) completed in only 1-2 minutes.  Each VM is
> effectively exactly the same (it's a build slave), so it's just the
> basic installation of the particular Fedora release, the build tools,
> and the build slave configuration.  Beyond the underlying fedora release
> version, the systems are configured exactly the same.
> 
> I migrated four similar VMs.  Three of them completed almost
> immediately.  The last too much longer.  The ONLY thing different about
> the one that took longer was that I decided to pack the disk first, so I
> ran:
> 
>   vmware-toolbox-cmd disk shrink /

I'm not familiar with this command.  In general terms, conversions
take a time proportional to the amount of disk space in use by the
guest.

Running `virt-v2v -v -x ...' and observing the output will give you a
good idea of what precisely it was doing for those hours.

Rich.

> in the VM prior to packaging it up as an OVA.  All the OVA files are
> relatively small and similar in size:
> 
> -rw------- 1 warlord warlord  1959553024 Nov  7 10:40 fc20-64.ova
> -rw------- 1 warlord warlord  1794907648 Nov  7 12:27 fc21-64.ova
> -rw------- 1 warlord warlord  2023595520 Nov  6 10:04 fc22-64.ova
> -rw------- 1 warlord warlord  3381622272 Nov  5 16:18 fc23-64.ova
> 
> The FC23 and FC22 migrations took the least amount of time, even though
> they were the largest.
> 
> > Rich.
> 
> -derek
> 
> -- 
>        Derek Atkins                 617-623-3745
>        derek at ihtfp.com             www.ihtfp.com
>        Computer and Internet Security Consultant

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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