- 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
Domino modes
Under typical conditions, when one side of a device pair becomes unavailable, new data written to the device is marked for later transfer. When the device or link is restored, the two sides synchronize.
Domino modes force SRDF devices into the Not Ready state to the host if one side of the device pair becomes unavailable.
Domino mode can be enabled/disabled for any:
- Device (domino mode) — If the R1 device cannot successfully mirror data to the R2 device, the next host write to the R1 device causes the device to become Not Ready to the host connected to the primary array.
- SRDF group (link domino mode) — If the last available link in the SRDF group fails, the next host write to any R1 device in the SRDF group causes all R1 devices in the SRDF group to become Not Ready to their hosts.
Link domino mode is set at the SRDF group level and only impacts devices where the R1 is on the side where it is set.
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