Freenas ZFS pool question

[Matt897]

I've set up a small freenas server to work as an offsite machine to my WHS. I've only thrown in a 1.5 terabyte drive and an extra 500 gig drive into it. I've pooled the two hard drives however, the only space I'm getting is about 498 gigs of usable storage out of a theoretical 2tb. Am I missing something here? I understand I would lose some space due to parity however there is no way I could lose that much unless the disks are too much of a gap in terms of total space that it throws the calculation off. Both are included in the storage pool and both work flawlessly as i've tested them in other machines.
am I missing something?

 

[sub.mesa]

You may have created a mirror instead of a striped pool. Show us the output of zpool status.

 

[Matt897]

yea, i realized what i did, instead of using striped, i did a raid 5 single parity pool with two drives, thus nixing out an entire terabyte and the other 500 gigs was the data protection. For some reason I thought i could do a redundant pool on this system, but striped data is not redundant, and the other options are not what I need (mirror, raid 5 double parity)

Pretty sure i'm going to switch to unraid

 

[adi]

Any data mirroring is going to be limited by your smallest drive, so your maximum space with any option to survive a single drive failure is going to be 500gb.