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zfs mountpoints inside jails



Hello,

I have the following scenario:
Jail "mail" is on a zfs (z0/usr/jails/mail), mounted on /usr/jails/mail
All IMAP mailboxes are on /srv/mail inside the jail.

To better utilize ZFS features such as snapshots on the IMAP mailboxes,
I have created a zfs (z0/usr/jails/mail-imap, montpoint /usr/jails/mail/srv/mail)

Is there a need to make the jail system aware of a zfs mountpoint inside
its root?
Could there be a situation where the zfs "z0/usr/jails/mail-imap" would
not be properly mounted, and the jail "mail" would not be able to access
it?

With kind regards,
fireglow