Establish an srdf pair by initiating a data copy from

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Establish an SRDF pair by initiating a data copy from the source side to target side. The operation can be a full or incremental. Restore remote mirroring, which initiates a data copy from the target side to the source side. The operation can be full or incremental. As noted in the slide title, these are decision support operations and are not disaster recovery/business continuance operations. In these situations, both the Source and Target sites are healthy and available. SRDF/Synchronous Operations
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32 Copyright 2015 EMC Corporation. All rights reserved. The split command suspends the links between source (R1) and Target (R2) volumes. The source devices continue to be read write enabled. The target devices are set to read write enabled. It enables read and write operations on the target volumes. Writes to the R1 devices accumulate as R2 Inv(alid) Tracks these are the tracks now owed to the R2 devices. Writes to the R2 devices accumulate as R1 Inv(alid) Tracks these are the tracks owed to the R1 devices. The RDF Pair state reflects Split. SRDF/Synchronous Operations
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33 Copyright 2015 EMC Corporation. All rights reserved. Establish operation will resume SRDF remote mirroring. Changes made to the source while in a split state, will be transferred to the target. Changes made to the target are overwritten. The R2 devices are set to Write Disable. Hence applications should stop accessing the R2 devices, prior to performing an establish operation. The links are resumed. SRDF/Synchronous Operations
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34 Copyright 2015 EMC Corporation. All rights reserved. As can be seen in the query output, the states of the devices are reverted to their normal state (R1-RW; R2-WD) and the links are resumed (RW). Changes made to the R2 device during the split state are discarded. Changes made to the R1 device during the split state are propagated to the R2 device. SRDF/Synchronous Operations
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35 Copyright 2015 EMC Corporation. All rights reserved. Restore operation will resume SRDF remote mirroring. Changes made to the target while in a split state, will be transferred to the source. Changes made to the source are overwritten. The R2 devices are set to Write Disable. Hence applications should stop accessing the R2 devices, prior to performing an establish operation. The links are resumed. As data on the R1 devices will change without the knowledge of the host, access to R1 devices should be stopped prior to performing a restore operation. As soon as the command completes, R1 devices can be accessed again without waiting for synchronization to be completed. Any required track on the R1 that has not yet been received from the R2, will be read across the links. SRDF/Synchronous Operations
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36 Copyright 2015 EMC Corporation. All rights reserved. As can be seen in the query output, the states of the devices are reverted to their normal state (R1-RW; R2-WD) and the links are resumed (RW). Changes made to the R1 device during the split state are discarded. Changes made to the R2 device during the split state are propagated to the R1 device.
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