Raid Migration

[andymed]

Hi i have an AS-204te with 2 x 3tb WD reds. It was setup as Raid 1 and had 3tb total capacity. Over the weekend i added a 3rd 3tb Red and migrated the Raid level from 1 to 5. I was expecting the total size of the volume to increase to 6tb with the addition of the new drive but capacity is still showing as was (2.74 tb). I followed all instructions, where have i gone wrong.

Effectively now i have 3 x 3tb wd reds but only have 2.74tb usable storage.