UUID used is the filesystem UUID and not the MD UUID.

The UUID seen in mdadm.conf are related to the MD drivers.

The UUID used in fstab are related to filesytems.

What you need are the filesystem UUID numbers. You can get them with a command line

sudo dumpe2fs /dev/md0 | grep UUID 

So in my case:

$ grep md/0 /etc/mdadm/mdadm.conf                                               ARRAY /dev/md/0 metadata=1.2 UUID=d634adc8:69deedd8:d491a79e:69aeff78  $ sudo dumpe2fs /dev/md0 | grep UUID   dumpe2fs 1.42.12 (29-Aug-2014) Filesystem UUID:          195237da-8825-45fb-abf7-a62895bd0967  $ grep boot /etc/fstab UUID=195237da-8825-45fb-abf7-a62895bd0967 /boot           ext4    defaults        0       2 

So we can see the UUID used is the filesystem UUID and not the MD UUID.

Your truly,

Tiruchirappalli Sivashanmugam