4*2TB drives in RAID 10 to 4*4TB drives in RAID 10 (EX4100)

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX Series
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Good day WD Community, this is my first post here, hope it is worth while.
I have asked the WD support this question and the details are below.
Opened 04/16/2017
I have a single RAID 10 volume. Originally 4*2TB drives in RAID 10. I had a drive failure and decided to move to 4TB red drives, and replaced the single failed drive with a 4TB red drive. this worked fine. when the second drive failed (both WD Green drives) I again replaced it with a 4TB red drive I have now replaced all 4 drives with 4 TB red drives and I want to expand the Volume to use the new space. Is there a process to expand the Volume like you would expand a partition? Is there a way to use my new available space without losing my current RAID 10 configuration and the associated Data?

I am disappointed in the search for this forum; however I did find one post that was reasonably close to my issue above.
The answer in 2015 for someone who had a two drive system was that he had to erase the Volume, reformat and then load his back up to take advantage of the new space. I don’t see that as reasonable really. Is this only way? Is there no way to just extend the Volume like you would a partition?

I don’t want to put to much ion this as the issue is similar but not the same. I see in my my cloud, under “Storage” “RAID” “RAID Volume” and right under that is the “Change RAID mode” button, and under that is a line of text that says “To create a new volume from the remaining available storage space, click here”
Does anyone know if this will allow me to create a new volume without disturbing the current volume?
Will this Volume also be RAID 10?
Does it use the un-allocated space or is this just the unused space in the current Volume?
I would be happy with another Volume if it used the new un-allocated space, still better than starting over and rebuilding the array and coping all the data back from a Back up.

Thanks for your time and attention.
Oh what is the normal turn around time for support to answer a question?

Jon

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I have the same situation but with RAID-5.

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In summary, while most traditional hardware RAID controllers do not allow expanding an existing RAID volume to utilize additional space from larger replacement drives, your NAS system appears to offer some promising options. The “Create a new volume from remaining storage space” functionality seems like it may enable you to create a separate additional RAID volume that takes advantage of the previously unused capacity from the larger 4TB drives, without disturbing your original RAID 10 volume and data. However, before attempting this, it would be prudent to confirm with your NAS vendor’s support that this option does indeed allow creating a new volume utilizing the unallocated space, while leaving your current RAID 10 configuration intact. If this is the case, it provides an ideal solution to gain some benefit from the increased drive sizes without the hassle of rebuilding the array from scratch. With proper confirmation, you can proceed with this approach and expand your available storage without data loss.