Expanding capacity on EX2 issue

My Cloud OS 5 My Cloud EX
1

Hello, I have tried to expand the capacity of my ex2 ultra from 2X2TB to 2X6TB and I can’t expand the capacity despite I did the following steps:

  1. remove disk from bay #2 (2TB)
  2. add new disk on bay #2 (6TB)
  3. remove disk from bay #1 (2TB) after rebuild finished
  4. add new disk on bay #1 (6TB) and wait for rebuilding
  5. get to My Cloud main menu
  6. click on “storage”
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  7. Under ‘Raid’ tab by ‘RAID Volume’, pick ‘Change RAID Mode’
  8. It’ll warn me that it’ll interrupt the current services. Press ‘continue’
  9. I picked RAID 1 and I should see ‘Expand Capacity’ option but it shows only the checkbox “Switch to RAID 1”
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Could anyone help me? Please…

2

You should review the documentation here:

https://support-en.wd.com/app/products/product-detailweb/p/130

What OS version is it? Make sure you look at the correct one.

In your case, note the warning!

WARNING!
Changes made to your RAID mode will delete all of your data and your user settings. See “Saving a Configuration File” for information on saving your user settings.

I suggest you have a complete backup before you proceed.

3

Thanks for your reply.
My version is 5.30.103.

4

Your WD My Cloud EX2 Ultra isn’t recognizing the full storage capacity after upgrading from 2TB to 6TB drives. This is a common issue with WD NAS devices, as they don’t always support seamless RAID expansion.

First, check if both 6TB drives are correctly detected under Dashboard > Storage > RAID. If the total volume is still 2TB, the system may not have updated the RAID metadata. Try rebooting the NAS and see if the Expand Capacity option appears.

If the option is missing, you can try expanding manually using SSH. Enable SSH in Settings > Network, connect with PuTTY, and run:

sh

Copy code

cat /proc/mdstat
mdadm --grow /dev/md2 --size=max
resize2fs /dev/md2

Reboot the NAS and check if the storage has expanded.

If this doesn’t work, back up your data, delete the RAID array, recreate RAID 1 with the 6TB drives, and restore your data. This will ensure the system recognizes the full capacity.