[Libguestfs] Virt-v2v conversion issue
Richard W.M. Jones
rjones at redhat.com
Tue Oct 14 06:44:00 UTC 2014
The ioctl failure is not an error, but it's unexpected, and maybe
hints at something deeper.
What version of libguestfs-winsupport is installed? It should be
7.1-3.el7 (assuming this is RHEL 7), which has support for fstrim of
aligned NTFS partitions.
- - -
Now on to the real problem ... 'qemu-img convert' is running, and then
fails. Does it hang or crash? I would enable core dumps and capture
one, since there's obviously a bug in qemu-img:
(1) As root do:
echo core.%p > /proc/sys/kernel/core_pattern
(2) Before running virt-v2v, do:
ulimited -c unlimited
and you should get a core.* file in the current directory when
qemu-img segfaults. Attach that file to gdb to get a stack trace:
gdb /usr/bin/qemu-img core.XYZ
(gdb) t a a bt
It's very unexpected for qemu-img convert to fail, especially from a
raw format local disk. But bugs can happen ...
If qemu-img is hanging, not crashing, then you can attach gdb directly
to the process and get a stack trace that way.
What version of qemu-kvm-rhev is this?
- - -
If fstrim is successful then it should greatly reduce the amount of
data to copy, both saving you lots of time and making the 'qemu-img
convert' bug harder to hit.
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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