CCC or Disk Utility to clone a Mac HD of one new iMac to another, over ThunderBolt, we are getting I/O errors. Even though the clone fails, the destination  system does boot and log in, however, the logins take a very very very long time.

When using CCC (Carbon Cophy Cloner) or Disk Utility to clone a Mac HD of one new iMac to another, over ThunderBolt, we are getting I/O errors. Even though the clone fails, the destination  system does boot and log in, however, the logins take a very very very long time.
Thoughts.
Edit: Already ran Disk Utility. Also reinstalled a fresh OS on top of the cloned OS and it seemed to remedy the problem. Then, cloned to next machine in the row of the lab. Same problem.

OK, by that I assume that you used Disk Utility to repair the subject disk and it reported "The volume (name) appears to be OK" in green.
Also verify you followed the instructions here: http://help.bombich.com/kb/usage-scenarios/i-want-to-clone-my-entire-hard-drive- to-a-new-hard-drive-or-a-new-machine
If so, the Thunderbolt connection begins to look suspicious.
Reinstalling OS X subsequent to the "clone" operation may be an acceptable workaround but you should not have had the I/O errors you describe, nor should the login times (subsequent to the initial login, that is) be unacceptably long. It calls into question the integrity of all the information that was transferrred.
I'll try to attract the attention of a CCC expert who will likely provide more competent assistance. You can also try the Bombich support site: http://help.bombich.com

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