Home > Storage > PowerMax and VMAX > Data Protection > Dell PowerMax and VMAX All Flash: SRDF/Metro Overview and Best Practices > SRDF/Metro online device expansion (ODE operations)
This section covers the new SRDF/Metro Online Device Expansion (ODE) feature for PowerMaxOS 5978 and Solutions Enabler/Unisphere for PowerMax 9.1.
Note: For Smart DR environments, please see procedures in the Smart DR subsection for Adding/Expanding Existing Devices.
In Solutions Enabler 9.0 and 5978 code, we introduced support for Online Device Expansion (ODE) for SRDF devices taking part in Synchronous (SRDF/S), Asynchronous (SRDF/A), and Adaptive Copy (ACP_DISK) relationships. At that time, this did not include support for SRDF/Metro ODE. With Unisphere for PowerMax and Solutions Enabler 9.1, we expanded our ODE support to include devices taking part in SRDF/Metro (Active) sessions. This functionality is based on modifications to our existing Geometry Compatibility Mode (GCM) functionality for host visibility of devices.
This feature provides the following functionality:
For SRDF/Metro DR (w/Async leg) support:
See Appendix D: Unisphere Online Device Expansion (ODE) steps for an example of the SRDF/Metro ODE interface in Unisphere for PowerMax 9.1.