Jingles shows more disk space than the available on the zones pool if the server has more than one pool. (See Screen Shot 2014-09-13 at 11.16.55 AM.png)
I suspect this is related with the way chunter is reporting the disk space available on the nodes.
NAME SIZE ALLOC FREE EXPANDSZ CAP DEDUP HEALTH ALTROOT
tank 928G 416G 512G - 44% 1.10x ONLINE -
zones 596G 10.7G 585G - 1% 1.00x ONLINE -
Suggested solution: Make chunter report only the space available on the zones pool or let FiFo be able to attach other pools to the machines.