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The copy direction of the TCz Synchronous pair will be reversed.
2.Stop business tasks at the TCz Synchronous secondary site.
3.Use Business Continuity Manager to execute the YKSUSPND FORWARD command on the TCz Synchronous pair.
TCz Synchronous pair will be split and the copy operation stops temporarily.
4.Use the main volume in the primary site to resume your business tasks.
5.Use Business Continuity Manager to execute the YKRESYNC FORWARD command on the TCz Synchronous pair.
The copy direction of the pair will be returned to its original direction.
6.Perform delta resync operation on the volume in the TCz Synchronous secondary site.
The status of the data volumes of URz pair changes as explained in the following table.
Table
URz Pair |
| Pair Status before Delta Resync | Pair Status after Delta Resync Operation | ||
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| Operation |
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| Primary Data | Secondary | Primary Data Volume | Secondary Data Volume |
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| Volume | Data Volume |
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URz pair between TCz | Hold | Hold | Duplex or Pending | Duplex or Pending | |
Synchronous primary site |
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| Duplex | Duplex | |
and URz secondary site |
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URz pair between TCz | Duplex or | Duplex or | Hold | Hold | |
Synchronous secondary | Suspend | Suspend |
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site and URz secondary |
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site |
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Caution on transferring business tasks back to the primary site when using delta resync:
After you remove failures from the primary site and other locations and then the system is changed to 3DC
Table
No. | If the Status of | and the Status of | Please Perform the Following Operation before Transferring |
| the Pair in the | the Pair in the URz | Business Tasks Back to the Primary Site |
| Primary Site is | Secondary Site is |
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Chapter 3 Preparing for Universal Replicator z/OS Operations |