I am currently testing live migration between two hosts. Everything works
as far as I can tell. I copied a large file over the network to the VM,
during copying I migrated the VM to the other host, and afterwards checked
the md5 sum of the file. No corruption so far.
This is Xen 3.0.2, exactly xen-3.0-testing cs 9602:09304a22b8d2,
linux 2.6.16.2 + patches.
Nevertheless I see some log messages, that I would like to understand.
Addtionally, after the 5th or 6th migration, I got some error messages
at the serial console (from the hypervisor) on the destination host:
(XEN) (file=memory.c, line=115) Could not allocate order=1 extent: id=0 flags=0
(0 of 1)
... repeated 10 times
(XEN) DOM0: (file=mm.c, line=486) Non-privileged attempt to map I/O space
00000000
(XEN) DOM0: (file=mm.c, line=486) Non-privileged attempt to map I/O space
00000000
(XEN) (file=memory.c, line=115) Could not allocate order=1 extent: id=0 flags=0
(0 of 1)
... repeated twice
The corresponding part of xend.log from the migration source and
destination hosts are attached.
Is this a bug, something to worry about?
Regarding these lines:
[2006-04-20 13:08:08 xend] ERROR (XendCheckpoint:227) netbuf race: iter 6, pfn
8acd. mfn ffffffff
I guess they are normal and don''t represent a problem, do they? I just
felt
uncomfortable because the log level is ERROR.
Here it''s more obvious that these are really no errors:
[2006-04-20 13:08:08 xend] ERROR (XendCheckpoint:227) All memory is saved
[2006-04-20 13:08:08 xend] ERROR (XendCheckpoint:227) Save exit rc=0
Best Regards,
Michael Paesold
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