See log errors below, trying to live migrate VM's from Xen 3.1.2 -> Xen 4.2.3. Perhaps we cannot live migrate across major revs?

[2013-11-13 11:49:00 xend 29149] DEBUG (XendCheckpoint:89) [xc_save]: /usr/lib64/xen/bin/xc_save 4 35 0 0 5

[2013-11-13 11:49:00 xend 29149] INFO (XendCheckpoint:353) Saving memory pages: iter 1   0%ERROR Internal error: Error when writing to state file (5) (errno 104)

[2013-11-13 11:49:00 xend 29149] INFO (XendCheckpoint:353) Save exit rc=1

[2013-11-13 11:49:00 xend 29149] ERROR (XendCheckpoint:133) Save failed on domain Pasiphae2 (35).

Traceback (most recent call last):

  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", line 110, in save

    forkHelper(cmd, fd, saveInputHandler, False)

  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", line 341, in forkHelper

    raise XendError("%s failed" % string.join(cmd))

XendError: /usr/lib64/xen/bin/xc_save 4 35 0 0 5 failed

[2013-11-13 11:49:00 xend.XendDomainInfo 29149] DEBUG (XendDomainInfo:2206) XendDomainInfo.resumeDomain(35)

[2013-11-13 11:49:00 xend 29149] DEBUG (XendCheckpoint:136) XendCheckpoint.save: resumeDomain

Thank you!

Jim