I have a Filer 720. Is there any way to resize an existing volume short of re-creating it?

Originally the volume started with all 18 GB drives. Overtime, as disks failed, they were replaced with 36 GB drives. So now we have some 36 GB drives that are only half used. See below:

RAID Disk HA.ID HA SHELF BAY CHAN Used (MB/blks) Phys (MB/blks) --------- ----- ------------ ---- -------------- -------------- parity 8.1 8 0 1 FC:A 34500/70656000 35003/71687368 data 8.4 8 0 4 FC:A 17000/34816000 34732/71132960 data 8.9 8 0 9 FC:A 17000/34816000 34732/71132960 data 8.3 8 0 3 FC:A 17000/34816000 17366/35566480 data 8.2 8 0 2 FC:A 17000/34816000 17366/35566480 data 8.0 8 0 0 FC:A 17000/34816000 17366/35566480 data 8.7 8 0 7 FC:A 34500/70656000 34732/71132960

Thanks,