Home > Storage > PowerMax and VMAX > Storage Admin > Dell EMC PowerMax and VMAX: Non-Disruptive Migration Best Practices and Operational Guide > Migrate a subset of devices in an SG
To migrate a subset of devices in an SG, divide that SG into a number of SGs. This is a non-disruptive operation.
In Unisphere, select the SG on the Storage Group Dashboard, click the More Actions menu, and select SG Maintenance > Split From.
The result is a stand-alone SG with its own masking view, using the same components as before the split, that is fully capable of being migrated using NDM. 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).
From Solutions Enabler, use the Symsg library.
symsg -sg <SgName> -sid <SymmID>
merge <SgName1>
split <SgName1> -view_name <MvName> -devs
For the split operation, the -sg <SgName> option is used to specify the source SG, for example, EnhancementsChild1 for the split operation. Specifying the name of the Storage Group create after the Split parameter (EnhancementChild1_Split) the devices to split with the -devs parameter and finally the -view_name option for the masking view create.