Carnajo, it's really nice. Say you have a media folder. It will not get full til all the disks are full. Greyhole moves the files to all disks, whichever has most room and balances between them, in the pool and just leaves the symlink in place of the original. You don't have to create new folders on other drives or make symlinks yourself to the newer movies or other media. Greyhole does it all for you.
I have Greyhole up and running, i added my existing SMB share (one disk, one copy, 200g), so far so good, i can see the share in Windows as a 200g disk. Then i tried to extend my share with a extra 200g disk in the pool, Windows sees a 400g share but when i copy files to the share it copies to the first disk and when i look into the pools tab only that disk is used, the first disk is filling up till full and then nothing. Except for the "disk full" warning in Windows.
Do i miss something? Cause you can use the whole 400g am i right?