Verifying that RHEL 5 LUNs are ready for transition using the CLI
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If your Red Hat Enterprise Linux (RHEL) 5 LUN is configured with a device mapper multipath (DMMP), you should verify that a file system is not configured before you transition the LUN from Data ONTAP operating in 7-Mode to clustered Data ONTAP.
Locate the SCSI device name for the LUN to be transitioned:
Identify the DMMP device name for the LUN:
The DMMP device name can be a device handle ID (WWID) such as
360a980003753456258244538554b4b53, or it can be an alias, such as,
Verify that the LUN does not have a file system:
dumpe2fs/dev/mapper/DMMP device name
If the LUN does not have a file system, Couldn’t find valid filesystem superblock is displayed in the output.