The exposure in your scheme is that  LISTSERV may need access to the data
on the disk. The  filemode itself is not an issue for  dynamic disks - as
long  as you  relink the  disk, LISTSERV  will re-access  as needed.  The
dynamic access code was designed  to withstand sysprog tampering (as long
as it is not done in the middle  of a command of course). However, if the
disk is not linked  when it is needed, LISTSERV gets  scared and logs out
to avoid losing  data. It doesn't know  how to relink it, and  even if it
did it might not be a good idea.
 
  Eric