Cannot boot up server after encrypting the SAN filesystem attached.

Issue

• Trying to set encryption using cryptsetup on a PowerPath device created from a 600GB LUN.

• The mapping has been added to /etc/crypttab as following :

  data   /dev/emcpowera1   none   LUKS
  

• The disk can be successfully mounted using the luksOpen command and can also be mounted when the system is up and running.

• When the machine is rebooted it fails to mount the encrypted file system and complains about a superblock problem.