creating new volumes

Hi, I recently installed 14 x 22tb disks into my Dell Powervault and added them to storage Pool A, I can see I have 249TB unused in the pool, but when I try to create a new volume it says I can only create 140TB.

Pool A consists of 14 x 3.8TB SSD drives along with the 14 x 22TB SAS drives.

I want to create a 220TB Archive volume