Hi all
I am fighting with live migration and the process is hanging with this
errors in xend.log of the sender dom0:
------------------------------- SNIP ---------------------------------------
...
[2008-01-17 00:30:20 663] INFO (XendCheckpoint:362) All memory is saved
[2008-01-17 00:30:20 663] INFO (XendCheckpoint:362) Save exit rc=0
[2008-01-17 00:30:20 663] ERROR (XendCheckpoint:140) Save failed on domain
grifone (16).
Traceback (most recent call last):
File "/usr/lib/xen-3.1-1/lib/python/xen/xend/XendCheckpoint.py", line
114, in save
qemu_fd = os.open("/tmp/xen.qemu-dm.%d" % dominfo.getDomid(),
os.O_RDONLY)
OSError: [Errno 2] No such file or directory: '/tmp/xen.qemu-dm.16'
[2008-01-17 00:30:20 663] DEBUG (XendDomainInfo:1793)
XendDomainInfo.resumeDomain(16)
[2008-01-17 00:30:20 663] DEBUG (XendCheckpoint:143) XendCheckpoint.save:
resumeDomain
[2008-01-17 00:30:20 663] ERROR (xmlrpclib2:178) Internal error handling
xend.domain.migrate
Traceback (most recent call last):
File "/usr/lib/xen-3.1-1/lib/python/xen/util/xmlrpclib2.py", line 131, in
_marshaled_dispatch
response = self._dispatch(method, params)
File "/usr/lib/python2.4/SimpleXMLRPCServer.py", line 415, in _dispatch
"""
File "/usr/lib/xen-3.1-1/lib/python/xen/xend/XendDomain.py", line 1240,
in domain_migrate
XendCheckpoint.save(sock.fileno(), dominfo, True, live, dst)
File "/usr/lib/xen-3.1-1/lib/python/xen/xend/XendCheckpoint.py", line
150, in save
raise exn
OSError: [Errno 2] No such file or directory: '/tmp/xen.qemu-dm.16'
...
-------------------------------- SNAP ----------------------------------
What is strange is that, after I stop watching the logs, i can see
that the /tmp/xen.qemu-dm.16 file *does exist*
Maybe it was created too late to be read by a restore process...?
Of course, after the migration hangs, I can:
- destroy both the partially?-migrated domU instances (on sender and
on receiver);
- create the domU again on the sender and it will get the next id,
let's say 17;
- rename /tmp/xen.qemu-dm.16 to /tmp/xen.qemu-dm.17, therefore the
file is in place in advance (!);
- restart the live migration
and everything will work, just after a longer delay.
But that's not the right way, I would say... :-]
I have read the Python functions in those files but they don't tell me
much more than the process cannot find a file and an exception is
handled...
More, I feel that my xend-config.sxp is OK for migration because I
made a migration of a GNU/Linux guest between the same dom0s just
before this one and it was perfect and immediate.
Now I am stracing the `xm migrate --live ...' command but I cannot see
anything significant... or I am too tired.
Any idea?
Thank you very much in advance!
Andrea
--
Andrea Brugiolo andrea.brugiolo@xxxxxxxx
Universita` degli Studi di Padova http://www.unipd.it
Centro di Ateneo per le Biblioteche http://www.cab.unipd.it
tel +39-049-827-3688 fax +39-049-827-3651
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