UUID (Universally Unique IDentifier) should be unique and it is used to identify storage devices on a linux system. If you cloned a virtual machine from vCenter, the metadata containing information of UUID for the filesystem will be identical for the original and cloned copy, therefore the UUID is no longer unique in /etc/fstab. The following steps will show how to change UUID of linux partition on CentOS 7. 1) Use blkid command-line utility to determine device UUID : # blkid Sample output : /dev/mapper/centos_centos71-root: UUID="2bc8e0d4-64b5-4dc8-bf4a-024fc980d98a" TYPE="ext4" /dev/mapper/centos_centos71-swap: UUID="577f9541-8d2a-4666-ac8f-ff84b584eeca" TYPE="swap" /dev/mapper/vg_data-centos7_vol: UUID="b100ad2b-ad89-4e2d-ba8e-7eda7d703c40" TYPE="ext4" 2) Another way to list out uuid
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