It doesn't matter how many drives there are. You could have every jail in a system on a separate pool (don't think in drives think in pools.) You could also have your media strewn across multiple different pools. Each pool needs a different name.
You are mounting the data inside of the jail. Where you choose to place it is YOUR choice. You select the jail in question from a drop down and you have to think of that jail as a separate computer. The source has NO CORRELATION with the destination.
The pool is tank, using something with "pool" in the name can bite you. In fact I would specifically shy away from naming the pool anything that is similar to any command you may ever issue.
So yes you analogy is correct but I will take it a step farther. You can mount
Code:
/mnt/tank/plexmedia
into
Code:
/usr/local/plexdata-plexpass/Plex Media Server/Media/
(which is the location point for my jail's plex media storage location) and have it work just fine. Now when you have the system setup however you have actually put the link into something like
Code:
/mnt/tank/jails/PlexMediaServer/usr/local/plexdata-plexpass/Plex Media Server/Media
as it is a mount point inside the jail you are creating a symbolic link (think shortcut) from one place to another. The jail thinking it is in effect it's own computer sees the data at /usr/local/plexdata-plexpass/Plex Media Server/Media/ but the data is actually /mnt/tank/jails/PlexMediaServer/usr/local/plexdata-plexpass/Plex Media Server/Media in the system.
Now to take a step farther a pool is setup with multiple drives as media storage and it is called tank with a directory called media and a sub directory called movies. Another pool is setup for jails and vm's and it is called systems. The FreeNAS it'self mounts both of them in the mnt directory. so you have:
Code:
/mnt/tank
/mnt/systems
You have a Plex jail setup and want to mount the media into the jail. So the source would be:
and the destination would be
What you have actually done though is create a link from /mnt/tank/media to /mnt/systems/jails/PlexMediaServer/mnt/media
Hopefully this helps to explain it all a little bit. The simple explanation is just select the jail and put the directory somewhere you can remember. And as far as a symbolic link
https://en.wikipedia.org/wiki/Symbolic_link may help.