Storage Node Management

Storage groups, nodes and the master node work the same way on both versions. The difference is deletion: 1.5 has none of 1.6’s referential-integrity checking, so deleting a group or a node is unconditional and silently orphans anything still pointing at it.

Which version am I on?

Check FOG Configuration → FOG Settings → General → FOG_VERSION in the web UI, or the version string printed at the top of installfog.sh.