Hello,
I filled the bug report http://bugzilla.openvz.org/show_bug.cgi?id=642 about the problem with tun device. It is really necessary to implement the migration of tun device! ![Smile](images/smiley_icons/icon_smile.gif)
As concerns moving 500Mb RAM... Do you really have so thick VE? ![Wink](images/smiley_icons/icon_wink.gif)
Well, ususally the dump file is not so large. You can check it by performing:
vzctl chkpnt VEID --dumpfile <file>
ls -lh <file>
Usually the most time-consuming part of migrating is syncing of private area. You can compress this data by adding "-z" option to rsync in vzmigrate script, as we already discussed...
Summary: Do you really think that the dump file is so big? (500+ Mb)
HTH,
Vasily