Preparing for the cutover phase when transitioning LUNs with mount points using DMMP device names on Linux hosts

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If you are transitioning a LUN with a mount point using an alias name on a Linux host, there are several steps you must perform before entering the cutover phase.

For FC configurations, you must have fabric connectivity and zoning to clustered Data ONTAP controllers.

For iSCSI configurations, your iSCSI sessions must be discovered and logged in to your clustered Data ONTAP controllers.

  • For copy-based transitions, perform these steps before initiating the Storage Cutover operation in the 7-Mode Transition Tool (7MTT).

  • For copy-free transitions, perform these steps before initiating the Export & Halt 7-Mode Systems operation in the 7MTT.

Steps
  1. Stop I/O to the mount points.

  2. Shut down the applications that are accessing the LUNs according to the application vendor’s recommendations.

  3. Unmount DMMP devices:

    umount dir_name

  4. Flush the 7-Mode LUN DMMP device ID:

    multipath -f device_name

    If needed, you can get the DDMP device name from the OS Device ID column under the SAN Host LUNs tab in the Inventory Assessment Workbook.

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