XigmaNAS

I have a ZFS dataset zfs0/Backup whose mount point is showing as /mnt/zfs0/Backup, as expected. This is occasionally disappearing from the mount point and becoming unusable. Nothing is showing in the logs to indicate that it is being dismounted.

a) How do I re-mount it without rebooting the server?
b) Why is it disappearing in the first place?

The ZFS file system looks perfectly OK and no errors are being reported.

Nas4Free version is 10.3.0.3

Simple explanation: The Nas4Free server in question is used for backing up a different server's ZFS file system and the backup has some mount points that were overwriting the main zfs volume. Changing the mount points manually allowed me to resolve this.