I got some helpful advice from people in NetApp on this one. If anyone else is thinking along the same lines, they might like to know of the existence of 6.2.1D1 which is just 6.2.1 plus a fix for 75012 (the CA-2002-19 thing). 6.2.1D1 isn't mentioned in the Bugs Online entry for 75012 yet, nor can it be downloaded from now.netapp.com, but it does exist and you should be able to get hold of it if you ask nicely!
Chris Thompson Email: cet1@cam.ac.uk