- Notes, cautions, and warnings
- Preface
- Introduction
- Disaster recovery
- High availability
- Data migration
- SRDF I/O operations
- SRDF write operations
- SRDF read operations
- SRDF/A resilience and performance features
- Management tools
- More information
Dell SRDF Introduction
Cascaded SRDF
Cascaded SRDF provides a zero data loss solution at long distances if the primary site is lost.
In a cascaded SRDF configuration, data from a primary (R1) site is synchronously mirrored to a secondary (R21) site. Then the data is asynchronously mirrored from the secondary (R21) site to a tertiary (R2) site.
Cascaded SRDF provides:
- Fast recovery times at the tertiary site
- Tight integration with the TimeFinder product family
- Geographically dispersed secondary and tertiary sites
If the primary site fails, cascaded SRDF can continue mirroring, with minimal user intervention, from the secondary site to the tertiary site. This enables a faster recovery at the tertiary site.
Both the secondary and the tertiary site can be failover sites. Open systems solutions typically fail over to the tertiary site.
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