- 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
Temporary link loss
In SRDF/A configurations, if a temporary loss (10 seconds or less) of all SRDF/A links occurs, the SRDF/A state remains active, and data continues to accumulate in global memory. This may result in an elongated cycle, but:
- The secondary array dependent-write consistency is not compromised.
- The primary and secondary array device relationships are not suspended.
Transmit Idle can keep SRDF/A in an active state during all links lost conditions.
In SRDF/S configurations, if a temporary link loss occurs, writes are stalled (but not accumulated) in hopes that the SRDF link comes back up, at which point writes continue.
Reads are not affected.
NOTE:Switching to SRDF/S mode with the link limbo parameter configured for more than 10 seconds could result in an application, database, or host failure.
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