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# SRDF/A control actions

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

Table 1. SRDF/A control actions
Action | Activate Type | Write Pacing Type | Description
--- | --- | --- | ---
Activate | DSE | N/A | This type activates the SRDF/A Delta Set Extension feature. This feature extends the available cache space by using device SAVE pools.
Write Pacing - this feature extends the availability of SRDF/A by preventing conditions that result in cache overflow on both the R1 and R2 sides. | Group write pacing | This type activates SRDF/A write pacing at the group level.
Group and Volume Write Pacing | This type activates SRDF/A write pacing at the group level and the volume level.
Volume Write Pacing | This type activates SRDF/A write pacing at the volume level.
Write Pacing Exempt | N/A | This type activates write pacing exempt. Write pacing exempt allows you to remove a volume from write pacing.

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