Home > Storage > PowerMax and VMAX > Data Protection > Dell PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices > IBM I (AS/400) operating system
The recommended best practice is to mask the R2 devices to the host operating system only when the SRDF/Metro reaches Active- Active or Active-Bias state.
The IBM i operating system contains native multipath capability which will automatically detect and configure multiple paths to the storage devices.
Note: Unisphere for VMAX cannot be used to configure SRDF/Metro for the IBM i host; however, it (U4V) can be used to manage the SRDF/Metro configuration once it has been created using CLI commands.