Home > Storage > PowerMax and VMAX > Storage Admin > Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide > Migrate a child-only SG
To migrate a child SG, we must first non-disruptively remove the child SG from the parent SG.
In Unisphere, select the parent SG from the Storage Groups dashboard. Click the More Actions menu and select SG Maintenance > Split From.
If there are multiple child SGs, select which one you would like to migrate and give a name to the masking view that will be created. Click Run Now.
Once the process is complete, the child storage group is promoted to tier one on the SG nesting with its own masking view to the host. For guidance on how to migrate the SG see the section on Metro-based NDM (Using Unisphere for PowerMax or Using Metro NDM using Solutions Enabler 9.x) or Metro-based NDM with precopy (Using Unisphere for PowerMax with precopy or Using Solutions Enabler 9.x with precopy).
With Solutions Enabler, use the symsg library:
symsg -sg <SgName> -sid <SymmID>
merge <SgName1>
split <SgName1> -view_name <MvName>
For the split operation, the -sg <SgName> option to specify the source SG, for example, EnhancementsSgParent for the split operation.
For a cascaded (parent child) source SG, the <SgName1> (EnhancementChild1 for example) option is used to specify the child SG to split from the parent. Use the view_name option to specify the name of the new masking view to be created. The source SG must be in a single masking view.