Why can't I mount my Amazon EBS volume?

Resolution

When you mount your Amazon EBS volume, you get the following error because the UUID conflicts with the XFS file system:

"root@:~# mount /dev/nvme2n1 /lv2mount: /lv2: wrong fs type, bad option, bad superblock on /dev/nvme2n1, missing codepage or helper program, or other error."

First, confirm that you have a UUID conflict issue. Then, change the UUID of the file system or ignore the UUID check to resolve the issue.

Confirm that you have a UUID conflict issue

Complete the following steps:

1. Run the blkid command to check the UUID of the file system:

   root@:~# blkid/dev/nvme0n1p1: LABEL="cloudimg-rootfs" UUID="ce780dbf-6f70-412d-87dd-61654730a231" TYPE="ext4" PARTUUID="bf0d338c-01"
   .......
   /dev/nvme1n1: UUID="2ddd89c4-415a-4aee-8431-abecdd8c79b8" TYPE="xfs"
   /dev/nvme2n1: UUID="2ddd89c4-415a-4aee-8431-abecdd8c79b8" TYPE="xfs"

2. Check the Linux kernel ring buffer to confirm that it's a UUID conflict issue:

   root@:~# dmesg | grep -i "Filesystem has duplicate UUID"
   [ 5444.389157] XFS (nvme2n1): Filesystem has duplicate UUID 2ddd89c4-415a-4aee-8431-abecdd8c79b8 - can't mount

Ignore the UUID check, or change the UUID of one of the file systems

To change the UUID of one of the file systems, run the following command:

root@:~# xfs_admin -U $(cat /proc/sys/kernel/random/uuid)  /dev/nvme2n1 
Clearing log and setting UUID
writing all SBs
new UUID = 02f8750a-c482-4ed1-949c-4088f2ecc04a
root@:~#  blkid
/dev/nvme0n1p1: LABEL="cloudimg-rootfs" UUID="ce780dbf-6f70-412d-87dd-61654730a231"
        TYPE="ext4" PARTUUID="bf0d338c-01"
/dev/nvme1n1: UUID="2ddd89c4-415a-4aee-8431-abecdd8c79b8" TYPE="xfs"
/dev/nvme2n1: UUID="02f8750a-c482-4ed1-949c-4088f2ecc04a" TYPE="xfs"
root@:~# mount /dev/nvme2n1 /lv2
root@:~# df -h |grep lv2
/dev/nvme2n1   1014M   40M  975M   4% /lv2

Or, use the nouuid option to ignore the UUID check:

root@:~# mount -o nouuid /dev/nvme2n1  /lv2
root@:~# df -h |grep lv2
/dev/nvme2n1   1014M   40M  975M   4% /lv2