Home > Storage > PowerMax and VMAX > Storage Admin > Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide > Pass-through NDM guide plan and environment review
Pass-through NDM walkthrough guide (source running 5876 code) describes two methods for NDM:
The duration of this walkthrough uses the VMAX arrays in the graphic below.
Pass-through NDM migrates SGs from 000198701161 to 000197800131.
Prior to the start of a planned migration, ensure that the prerequisite checks for using NDM have been completed:
Even though the guide takes you through the detailed device examination after each step as well as diving into the workings of each of the issued commands, it should be noted that the user needs to issue three commands to migrate an SG from source to target.
Note: A host rescan that will result in the permanent removal of the now inactive paths should not be undertaken post-cutover, this will limit the ability for the migration to be seamlessly canceled and normal operation reverted to the source array. In the case of multiple concurrent NDM sessions sharing the same host the same rule should apply across all sessions when issuing rescans.