Hi atemka,
No, the link was not mirrored. However, I figured that since the offline chunk contained system catalogue info and I had a backup which was restored on my test server about a month or two back and there were no changes to the actual tables recently, I then ftp'ed the chunk from test into the production box, overwriting the existing chunk which was offline. Then I refreshed my link and was able to get it back online with onspaces.
Thanks artemka