We had been using amd instead of autofs on a large  server, with possibly 100 - 
200 concurrent login sessions. 
With autofs, each home directory  for a logged in user would be a separate 
mount point.  We found that things 
started to get ugly,  when the number of mount points  grew to a number 
somewhat less than 256, maybe 200
to 220.    Using instead static mounts  from the file servers, and then using 
amd to manage symlinks, via map
entries for /home of the form  
     username fs:=/directory/path;type:=link
keeps the number of nfs mounts down to the number of static mounts.

We have been using autofs on all our other linux boxes (Ubuntu and Fedora).    
But due to this issue 
we had been using amd on our main instructional server, now running Ubuntu.

Have other people  had success with using autofs for /home, with large numbers 
of concurrent logins?
With more than say 256 nfs mount points?

Phil

-- 
With Lucid Lynx after upgrade or install mounts mounted with automounter daemon 
don't mount
https://bugs.launchpad.net/bugs/571972
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