Archive to tape software

[ZZASSGL%cms.manchester-computing-centre.ac.uk at nsfnet-relay.ac.uk]

I am looking for a file archive system for a large Sys V Unix (UTS) system.
 
It should include automatic migration of old, rarely used files to tape
as well as explicit user requests for files to be archived.  The files
should be retrievable by user command, or even better, automatically when
a file is referenced.
 
Geoff. Lane.
UTS Sys Admin
mcc