vxvm problem in redhat 5.4

Hi

I have a problem related to vxvm. I am using redhat5.4 64 bit
vxassist -g mydg growto my-vol 2G (Actually when i am running this command then this command is not increasing the size of volume but this command is running fine and the size which i have given to my volume it has been reduced from disk becoz when i am checking vxassist -g mydg maxsize so 2GB size deduct from group...........:wall:

Kindly help
Jeevan Bhatt