Preparing for cutover when transitioning a Linux host DMMP device without a file system

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If you are transitioning a DMMP device without a file system from 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 operation in 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. Flush the 7-Mode LUN DMMP device or alias:

    multipath -f device_name

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