To invoke a suspend the rdf pairs must already be in

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To invoke a suspend, the RDF pair(s) must already be in one of the following states: Synchronized R1 Updated SRDF/Synchronous Operations
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19 Copyright 2015 EMC Corporation. All rights reserved. Resume is a singular operation. To invoke this operation, the RDF pair(s) must already be in the Suspended state. Data transfer from R1 to R2 is resumed. The pair state will remain in SyncInProg until all accumulated invalid tracks for the pair have been transferred. Invalid tracks are transferred to the R2 in any order so write serialization will not be maintained. The link is set to Read Write. The R1s continue to be Read Write enabled and the R2s continue to be Write Disabled. SRDF/Synchronous Operations
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20 Copyright 2015 EMC Corporation. All rights reserved. This lesson covered initial SRDF setup operations. Creating dynamic RDF groups and RDF pairs using SYMCLI was presented in detail. Basic SRDF operations were also discussed. SRDF/Synchronous Operations
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21 Copyright 2015 EMC Corporation. All rights reserved. This lesson covers SRDF Disaster Recovery operations. Device and link states under different conditions are presented in detail. Host consideration when performing DR operations are also discussed. SRDF/Synchronous Operations
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22 Copyright 2015 EMC Corporation. All rights reserved. The SRDF disaster recovery operations are: Failover from the source side to the target side, switching data processing to the target side Update the source side after a failover while the target side is still used for applications Failback from the target side to the source side by switching data processing to the source side SRDF/Synchronous Operations
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23 Copyright 2015 EMC Corporation. All rights reserved. The failover operation can be executed from the source side host or the target side. This is true for all symrdf commands. In order to perform operations from the target side, a device group of type RDF2 should be created and the R2 devices should be added to it. In the event of an actual disaster, this is helpful as there would be no way of communicating with the source VMAX3 array. The operation assumes disaster situation - makes all effort to enable data access on the target VMAX3 array: Will proceed if possible Will give message for any potential data integrity issue As can be seen in the output, the R1 devices are write disabled, the SRDF links between the device pairs are logically suspended, and the R2 devices are read write enabled. Host accessing the R2 devices can now resume processing the application. While in a true disaster situation when the source host/array/site may be unreachable, the steps listed below would be recommended if performing a “graceful” failover to the target site. If failing over for a Maintenance operation: For a clean, consistent, coherent point in time copy which can be used with minimal recovery on the target side some or all of the following steps may have to be taken on the source side: Stop all applications
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