EMC SRDF/Metro SmartDR configuration
PowerHA® SystemMirror® uses Symmetrix command-line interface (SYMCLI) to discover and integrate the replicated storage from an EMC storage device into the High Availability and Disaster Recovery (HADR) framework. You can use this configuration to manage the HADR framework for applications that are using mirrored storage devices. In addition to traditional EMC Symmetrix Remote Data Facility (SRDF) configuration, EMC provides SRDF/Metro SmartDR configuration that uses three SRDF/Metro storage devices. EMC SRDF/Metro SmartDR configuration is a two-region HADR framework, which integrates SRDF/Metro and SRDF/Async replicated resources.
The EMC SRDF/Metro SmartDR configuration adds the following capabilities to SRDF/Metro replicated resources:
- Integrates SRDF/Metro (Metro) and SRDF/Async (SRDF/A) replicated resources by enabling HADR framework for a SRDF/Metro session.
- Replicate data to a single SRDF/Metro storage device by coupling the SRDF/A sessions on each side of a SRDF/Metro resource pair.
- Witness configuration is reuired for all EMC SRDF/Metro SmartDR configurations.
- Only a single SRDF/A session can send data to the disaster recovery site.
- If you switch an application data transfer to another site, ensure that a copy of dependent writes of the application data is maintained on the disaster recovery site.