Removing disk from a volume storage space 2012 r2

Hi, I've got a issue, here's my situation, i'm using storage space on a windows server 2012 R2 for my backups. Fisrt I had 14 3tb disk in mirror so there was 19tb usable for date. Now I needed more space so I just added 14 more disk and I extended the virtual
disk to 38tb. Then when I wnet into windows management -> disk management to extend the partition to use the full 38tb, I got the following error message
Virtual Disk Service error:
The volume cannot be extended because the number of clusters will
exceed the maximum number of clusters supported by the file system
Then I realized that the cluster size where only at 8k, reading on the Web i understood that I couldn't get more then 32tb.
Now I would like to remove all of the 14 disk I just added in the pool and create a new pool with 64Ko cluster size so I wont worry about my next size upgrade.
I'm afraid that even if windows see the added space has a not allocated space, the storage pool is now using the disks. I can't afford to lose any data.
How can I proceed??
I saw procedure on this site but they seem's to be for removing 1 disk... since I have 14 disk fully integrated in my pool I am a bit nervous following a one disk procedure
thank you

Hi,
As you have already added the 14 new disks into your existing pool, you will need to check if virtual disk is already extended onto these new physical disks. 
If not, you should able to remove them from the pool - if virtual disk is already extended onto these new disks, It will ask for replacement to replace them with new hard disks. 
If a part of hard disks could be removed, maybe you can migrate data onto these hard disks (no need to create a storage pool), delete the existing pool to recreate and migrate files back. 
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