- 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
Synchronous mode
SRDF/Synchronous (SRDF/S) maintains a real-time mirror image of data between the R1 and R2 devices. The recommended distance between the devices is 200 km (125 miles) or less because application latency may rise to unacceptable levels at longer distances.
Host writes are written simultaneously to both arrays in real time before the application I/O completes. Acknowledgments are not sent to the host until the data is stored in cache on both arrays.
Write operations in synchronous mode and SRDF read operations have more information about I/O operations in synchronous mode.
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