To avoid potential errors with Authentication Services, you may opt to move /var/opt/quest to its partition or symlink it.
As a general rule, please make sure that the free space you are providing to /var/opt/quest is around four times the current space being used by the directory: i.e., du -sh /var/opt/quest * 4
If you are using RHEL and similar distributions, make sure you add the proper SELINUX rules in case you have SELINUX in ENFORCED mode.