When alerts are logged and errors are displayed during multisite configuration if disk space is not sufficient.
To add an additional partition:
sudo su
/tce/etc/wanos/wanos-fdisk sda
reboot
mkfs.ext3 /dev/sda2
reboot
set the datastore to sda2 in the gui
This is based on the assumption that the only drive installed is sda and that is where the un-partitioned free space is located. If a second drive was added it would normally be sdb. Double check the output of the commands.