does this mean that when I have 7 VLAN of 250 hosts each, if these VLANs are members of the same pool, I can get an IP address from the DHCP server in any VLAN of the pool, even if the first VLAN is not full yet? I mean, if I have 2 phones and they connect to a WLAN which is attached to the VLAN pool, one can get an IP from VLAN 1 and the other from VLAN 2?
Yes, as Phil mentioned, VLAN pooling was based off the client's mac address and a hash was done in order to determine which VLAN the user will end up in. So you may fill up a vlan or not as it depends on the mac address.
In SmartZone 6.0, this has been enhanced to distribute it more evenly.