Verifying that RHEL 5 LUNs are ready for transition using the CLI

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.

Steps

  1. Locate the SCSI device name for the LUN to be transitioned:

    sanlun lunshow

  2. Identify the DMMP device name for the LUN:

    multipath -11

    The DMMP device name can be a device handle ID (WWID) such as 360a980003753456258244538554b4b53, or it can be an alias, such as, dmmp_raw_lun.

  3. 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.