My server had 6 slto sata, now i need more space. With Freenas is possible add disk another pool disk hardware ( another server ) and see only one volume group ?
FreeNAS doesn't support clustering. If your enclosure has room for more disks, add an HBA to connect them and go to town. If not, add an HBA and an external JBOD shelf, or move your pool to hardware that has room for more disks.