Hi Mike, A colleague of mine did some hunting of his own and found that if he restarted nfs on the server (mseas-data) then the client was able to mount the disk. Thank you very much for all of your time and help. Pat >> Hi Mike, >> >> I think v3 but I'm not sure (how do I check >> this?). At any rate, I tried your suggestion >> both ways >> >> [root at mseas etc]# mount -o vers=3 mseas-data:/home >> mount.nfs: Unknown error 521 >> >> [root at mseas etc]# mount -o vers=4 mseas-data:/home >> mount.nfs: mounting mseas-data:/home failed, reason given by server: >> No such file or directory >> >> What should I look at next? > > You appear to be missing the target mountpoint in your manual commands. It > should probably look more like: > > mount -o vers=3 mseas-data:/home /home > > On the other hand, a Google search for "mount.nfs: Unknown error 521" > turns up some interesting information: > > https://www.google.com/search?q=mount.nfs+unknown+error+521&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a > > One of the items is a bug report from Fedora in which it turns out that > the /etc/exports file has some sort of corruption (probably invalid > characters) in it that was causing the NFS server system to not properly > export the filesystem. > > You may try, on the mseas-data system, to run "exportfs" to see what the > system thinks it's exporting. -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Pat Haley Email: phaley at mit.edu Center for Ocean Engineering Phone: (617) 253-6824 Dept. of Mechanical Engineering Fax: (617) 253-8125 MIT, Room 5-213 http://web.mit.edu/phaley/www/ 77 Massachusetts Avenue Cambridge, MA 02139-4301