- 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
SRDF/Star restrictions
- GNS Remote Mirroring is NOT supported with SRDF/STAR configurations .
- Devices that are part of an RecoverPoint configuration, cannot at the same time, be part of an SRDF/Star configuration.
- The RDF groups that are part of an SRDF/Star CG cannot contain any devices that are not part of the SRDF/Star CG.
- Devices that are part of a SRDF/Star CG should not be controlled outside of symstar commands.
- Devices that are part of an SRDF/Metro configuration cannot at the same time be part of an SRDF/Star configuration.
- If any array in a SRDF/Star configuration is running PowerMaxOS 5978, Solutions Enabler 9.0 or later is required in order to manage that configuration.
- If any array in a SRDF/Star configuration is running PowerMaxOS 10 (6079), Solutions Enabler 10.0 or later is required in order to manage that configuration.
- Each SRDF/Star control host must be connected to only one site in the SRDF/Star triangle. An SRDF/Star control host is where the symstar commands are issued.
- A minimum of one SRDF daemon must be running on at least one host attached locally to each site. This host must be connected to only one site in the SRDF/Star triangle. The host could be the same as the Star control host but is not required unless using
symstar modifycg.
Dell Technologies strongly recommends running redundant SRDF daemons on multiple hosts to ensure that at least one SRDF daemon is available to perform time-critical, consistency monitoring operations. Redundant SRDF daemons avoid service interruptions caused by performance bottlenecks local to a host.
- SRDF/A recovery links are required.
- SRDF groups cannot be shared between separate SRDF/Star configurations.
- R22 devices are required in SRDF/Star environments that include VMAX 10K arrays.
- All SRDF/Star device pairs must be of the same geometry and size.
- All SRDF groups including inactive ones must be defined and operational prior to entering SRDF/Star mode.
- It is strongly recommended that all SRDF devices be locally protected and that each SRDF device is configured with TimeFinder to provide local replicas at each site.
- Composite groups consisting of device groups are not supported.
- Devices enabled as part of consistency groups cannot at the same time be part of an SRDF/Star configuration.
- Devices cannot be BCV devices.
- BCV device management must be configured separately.
NOTE:
Dell Technologies strongly recommends that you have BCV device management available at both the synchronous and asynchronous target sites.
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