In case you decided to exploit a shared file system, AFTER EACH UPDATE, edit the BLAH configuration file (/etc/blah.config) and add the blah_shared_directories parameter (N.B: the YAIM reconfiguration and the update of the glite-ce-blahp module don't preserve this manual modification) and restart gLite services:
# echo "blah_shared_directories=/home:/var/cream_sandbox" >> /etc/blah.config
# service gLite restart
In case of SHARED FS - pay attention on NFS mounting on WNs, in /etc/fstab, have something like: