root / # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 250G 0 disk
└─xvda1 202:1 0 250G 0 part /
xvdf 202:80 0 16T 0 disk /vol-azure *here
#format it
mkfs -t ext4 /dev/xvdf
mkdir /folder
mount /dev/xvdf /folder/
#errors
and found the error with duplicate UUID
[ec2-user@ip-172-XX-XX-XX ~]$ sudo mount -o nouuid /dev/xvdf2 /mnt