zfs size looks odd

[phynias]

ok so first off i have to apologize because i feel really dumb for having to come here and ask this, but i have been looking around and staring at this for a while and i can not figure out what is going on.

so as you can see in the attached image i have a single zfs. my question is why is there such a huge discrepancy in size between the first line 13.3tb and the second 8.9 tb? did i set something up wrong when i first configured it? i never noticed this before so i feel even dumber, but hey gotta learn.

also if it is something i misconfigured can i fix it now to get back that lost space?

this is running 6 - 3tb drives.
output of zpool list:
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
freenas-boot 7.44G 970M 6.49G - - 12% 1.00x ONLINE -
zfs1 16.2T 13.3T 2.94T - 15% 81% 1.00x ONLINE /mnt


thanks so much!

 

[enemy85]

the first line it's the total including the space used for parity/redudancy.
the second line it's the real space after parity (raidz1/raidz2)

 

[Robert Trevellyan]

Your numbers match this calculator if your pool is configured as RAID-Z2. That's a sensible configuration for 6 disks, so you didn't do anything wrong there. However, you have a problem because your pool is over 80% full, which represents a threshold for write performance.

 

[phynias]

thanks guys makes sense now.
and i know about the 80%, that's what made me start looking.
time to get some 6tb drive =p

 

[Alister]

Checking my own system

6 x 2.0TB disks or 6 x 1.819 TiB Discs = 10.9TiB not the 12 you think you have.

 

[Mlovelace]

thanks guys makes sense now.
and i know about the 80%, that's what made me start looking.
time to get some 6tb drive =p

Nice avatar btw :D