As we're running DPM, the procedure was fairly trivial, and is documented on the ScotGrid wiki.
We've also fixed and re-enabled the DPM information provider script, which Graeme reported broken in this blog posting.
ldapsearchquery shows that we're now advertising the new tokens correctly:
# atlas:ATLASPRODDISK:online, svr018.gla.scotgrid.ac.uk, resource, grid
GlueSAName: Replica online storage for VO atlas
All in all, a productive few minutes' work...I wonder how those with dCache are coping...