Two different disks show the same UUID and updating UUID also applies to both

Issue

• After adding a new local disk, it shows the same UUID for /dev/sdb1 and /dev/vx/dmp/disk_0s1

[root@localhost by-id]# blkid 
...
/dev/sdb1: UUID="660c40f1-d3ea-48f4-a0da-e94b1de8b5f5" TYPE="ext4" 
/dev/vx/dmp/disk_0s1: UUID="660c40f1-d3ea-48f4-a0da-e94b1de8b5f5" TYPE="ext4" 

• If changes the UUID for one disk, it applies to the other as well

[root@localhost by-id]# uuidgen 
56c04d8f-3e30-4e94-82f2-9848568414ef
[root@localhost by-id]# tune2fs /dev/vx/dmp/disk_0s1 -U 56c04d8f-3e30-4e94-82f2-9848568414ef
tune2fs 1.41.12 (17-May-2010)
[root@localhost by-id]# blkid 
...
/dev/sdb1: UUID="56c04d8f-3e30-4e94-82f2-9848568414ef" TYPE="ext4" 
/dev/vx/dmp/disk_0s1: UUID="56c04d8f-3e30-4e94-82f2-9848568414ef" TYPE="ext4"