I created a 10 disks RAID10 using EBS on AWS EC2 using mdadm on a ubuntu 12.04.2 LTS instance. Let's call this instance A. It works fine and I can create files and folders perfectly in the volume.
I want to share the volume via NFS to be accessible via another instance B. So, I installed the NFS server on instance A and the NFS client on instance B and I was able to mount the RAID10 Array from A on B using NFS. I can see the files via B.
The problem is that If I try to create anything (files or folders) in the mounted volume on B, I get a permission denied even if I'm root.
Am I forgeting something?
Thank you very much for any help.