Volume Expansion

I have an EX4100 with 4x 2 TB WD Red drives in a RAID-5, which I’m replacing with 4 TB WD Red drives. I’ve swapped the disks one-by-one until the RAID was rebuilt. However, the system still shows Volume_1 as 6 TB usable space (instead of 12 TB). How would I go about expanding “Volume_1” to utilize the full 16 TB of new space (without losing my data)?

PS: Currently running firmware: 2.30.165

Have you read through the User Manual (https://support.wdc.com/product.aspx?ID=2702) to see if it explains how to expand.recover storage space when adding/changing hard drives in the multi bay My Cloud unit?

You may have better luck in the dedicated EX series subforum where people more knowledgeable about the EX series may be able to assist. This subforum (My Cloud) is generally for the single bay/single drive My Cloud units.

https://community.wd.com/c/network-attached-storage/my-cloud-expert-series