"filesys disable" would probably serve you better than nfs disable. I'd be careful with that if you leave TSM up and running -- you just yanked your FILE device class and NFS mounted filesystem out from under a running server. You may have a bit if clean up to do later for any volume TSM tried to access. Or worse case, depending on where and how you mounted the NFS filesystem...
If I can't shut down my TSM server, I'd prefer the approach described earlier with updating the "nextstgpool" parameter. All of these statements are my personal preference and have no basis in fact or reality :)
