Ill post the update here aswell
Thanks,
So something weird happen,
I used Recuva and got pretty much every file off that drive, as the drive wasn't formatted or anything, the files just vanished.
Copied the recovered files back onto the same drive via iSCISI on another machine (the drive pool VM was off)
After that was done i turned back on the Drive pool machine, it scanned the drive and then said everything on that drive was a duplicated file, i left it for an hour and came back to the image i have attached, It has cleared the drive again BUT all my files still exist, i have compared the files i recovered to the ones on drive pool and they all exist... but that iscisi drive is still empty...
Which leads me to believe that drive for some reason, maybe during a drive pool update? it decided to move all the files off it and onto the other drives?
Its got me super confused, as the last time i checked drivepool (about 2 months ago) files where balanced over the 3 drives but according to this only 2 where actually used
Also it seems it isnt re balancing itself