Two more error messages have propped up over the weekend as I migrated more volumes.
The first was wafl.readdir.expired and the 2nd was wafl.cp.toolong. The first error message is a bug, according to Netapp. Corrective action seems to come down to restructuring the directory, which simply isn't feasible. I assume upgrading will resolve this issue
The 2nd error message is directly related to my migration attempts as well, and there doesn't appear to be anything I can do to address that one. wafl seems to be a consistent culprit, it seems.
I still have a case open with Netapp, but i'm hoping that anyone here can shed light on the issue