I thought I set up a ZFS RAIDZ with 8 disks. I realize that two are for redundancy, but that should leave 6 that are for storage, correct? How can I tell what was set up in ZFS Volume manager?
You've got two vdevs that are RAIDZ2, so you have only 4 disks of data and 4 disks of redundancy. 4.0TB formats to 3.72TB in capacity. Multiply that by 4 and you get 14.88TB. Of course you have a bunch of data there already which has made the available size smaller.
I'd say that if you aren't happy with the size the reason is because you have two vdevs. ;)
Yes you will have to re-create the pool. If the space for you current is fine, you could make the pool striped mirrors (RAID 10) and get more performance with the same capacity.
Last question. I don't want to loose my jails/plugin settings. I created a backup image, but it was with the 2 vdevs. Am I out of luck, or can I recover these settings once I create a singe volume?
What I'd do is grab a spare disk and do a zfs snapshot and replicate to a spare drive (make a single disk pool temporarily). Then replicate the data to the new pool once it's recreated.
If your spare disk is big enough you could even replicate the whole pool to the spare pool just for migration purposes. ;)
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