To increase the size of the storage, you should know the correct syntax to be used.
snapdrive storage resize -dg file_spec { -growby | -growto } size [-addlun [-igroup ig_name [ig_name ...]]] [{ -reserve | - noreserve}]] [-fstype type] [-vmtype type]
The snapdrive storage resize command does not support directly on logical volumes or file systems. For example, you cannot use the snapdrive storage resize command to resize a file system on a LUN.