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# SRDF session options

SRDF transparently remotely mirrors production or primary (source) site data to a secondary (target) site to users, applications, databases, and host processors.

Session option | Description | Available with action
--- | --- | ---
Bypass | This option bypasses the exclusive locks for the local or remote storage system during SRDF operations. Use this option only if you are sure that no other SRDF operation is in progress on the local or remote storage systems. | Establish Failback Failover Restore Incremental Restore Split Suspend Swap Write Disable R1 Ready R1 Ready R2 RWDisableR2 Enable Disable
Consistent | This option allows only consistent transition from async to sync mode. | Activate
Consistency Exempt | This option allows you to add or remove volumes from an SRDF group that is in Async mode without requiring other volumes in the group to be suspended. | Half Move Move Suspend
Establish | This option fails over the volume pairs, performs a dynamic swap, and incrementally establishes the pairs. This option is not supported when volumes operating in Asynchronous mode are read/write on the SRDF link. To perform a failover operation on such volumes, specify the Restore option. | Failover
Force | This option overrides any restrictions and forces the operation, even though one or more paired volumes may not be in the expected state. Use caution when checking this option because improper use may result in data loss. | Establish Incremental Establish Restore Incremental Restore Write Disable R1 Ready R1 Ready R2 RWDisableR2 Enable Disable Swap
Immediate | This option causes the suspend, split, and failover actions on asynchronous volumes to happen immediately. | Suspend Split Failover
NoWD | The No write disable option bypasses the check to ensure that the target of operation is write disabled to the host. This option applies to the source (R1) volumes when used with the Invalidate R1option and to the target (R2) volumes when used with the Invalidate R2 option. |
SymForce | This option forces an operation on the volume pair including pairs that would be rejected. Use caution when checking this option because improper use may result in data loss. | Restore Incremental Restore Write Disable R1 Ready R1 Ready R2 RWDisableR2 Enable Disable Swap
Refresh R1 | This option marks any changed tracks on the source (R1) volume to be refreshed from the target (R2) side. | Swap
Refresh R2 | This option marks any changed tracks on the target (R2) volume to be refreshed from the source (R1) side. | Swap
Remote | This option is used when performing a restore or failback action with the concurrent link up, data that is copied from the R2 to the R1 is copied to the concurrent R2. These actions require this option. | Restore Incremental Restore Failback
Restore | When the failover swap completes, invalid tracks on the new R2 side (formerly the R1 side) are restored to the new R1 side (formerly the R2 side). When used together with the Immediate option, the failover operation immediately deactivates the SRDF/A session without waiting two cycle switches for session to terminate. | Failover