VD size is less than total associated volume size ; storagetek 6540

Hi,

I have one VD having 465GB*12 disk in RAID 5 configuration. So my VD size is 11*465Gb=5TB.

while I am checking the associated volumes size , the total size of associated volume becomes 6TB. So how a 5TB VD can hold 6TB volumes?

root@cam # ./sscs list -a mystor vdisk 7
Virtual Disk: 7
  Status:               Optimal
  State:                Ready
  Number of Disks:      12
  RAID Level:           5
  Hot Spare Coverage:   Yes
  Total Capacity:       6.360 TB   <<<        Believe it is showing size of pool(has a associated profile) & not the size of VD
  Configured Capacity:  6.000 TB    <<<<,  total size of volume associated.
  Available Capacity:   369.646 GB
  Array Name:          mystor
  Array Type:           6540