[Libguestfs] Virt-v2v performance benchmarking part 3

[Richard W.M. Jones]

On Sun, Jan 09, 2022 at 06:51:42PM +0000, Richard W.M. Jones wrote:
> 
> Part 1:
> https://listman.redhat.com/archives/libguestfs/2022-January/msg00055.html
> Part 2:
> https://listman.redhat.com/archives/libguestfs/2022-January/msg00057.html
> 
> This is part 3 of my performance analysis of virt-v2v over the last
> year.  In this email I cover conversion from VMware to a local disk
> using VDDK.  This is a more realistic test than doing local disk to
> local disk conversions.
> 
> As you can see from the new chart in the attached file [LibreOffice
> Calc format] modular virt-v2v has got a little faster over all, with
> conversion taking slightly longer and copying being slightly faster.
> 
> If you expand the hidden columns (between columns F & M) you will also
> see clearly the new flushing behaviour of nbdcopy, where it always
> flushes the output to disk, versus "qemu-img convert" which used the
> page cache (notice the Sync times in column L).  This can make old
> virt-v2v appear to be much faster, but the appearance is not real.

I meant to record the virt-v2v command I used, which was:

$ virt-v2v -ic 'esx://root@example.com/?no_verify=1' \
  	   -it vddk \
	   -io vddk-libdir=vddk-7.0.0/vmware-vix-disklib-distrib \
	   -io vddk-thumbprint=<thumbprint> \
	   -ip /tmp/vmware-passwd \
	   'Fedora 35 standard test' -o local -os /var/tmp

The version of VDDK was 7.0.0 in all tests.

Rich.

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