If you reset your configuration to default or you re-install and you want to keep the old pool you MUST import the old pool from command line before re-creating the pool from FreeNAS WebGUI. By creating the pool from WebGUI you destroy the old pool and create a new one. 

If you don’t know the name of your old pool run the following command to find all pool’s available:

zpool import -f

Once you know the name of the pool import the pool:

zpool import -f [pool name]

Make sure that the pool is mounted:

mount | grep zfs

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