•Status of the primary data volume is Hold
•Using the volume of TCz Synchronous pair as the primary data volume
If you use TCz Synchronous
•Secondary data volume uses two mirror IDs; the status of the secondary volume which uses one of the two mirror IDs is Hold, and the status of the secondary volume which uses another mirror ID is Duplex or Suspend
•All differential data between the primary and secondary data volume is stored in the master journal group
Note: Right after you have created the URz pair for delta resync operation, or if the failure occurred at the primary site right after the recovery of TCz Synchronous or URz pair, only a part of the differential data between the primary and secondary data volume may be stored in the master journal group.
When either of the abovementioned requirements is not fulfilled, usually an error occurs and delta resync operation will fail. Especially in the following cases, delta resync operation will not be performed since the necessary journal data does not exist:
•When the primary data volume in the URz pair for delta resync operation is updated after creating the URz pair, but URz primary data volumes that are also used as TCz Synchronous primary data volumes are not updated in the primary site
•When the volumes in the primary site are updated after splitting TCz Synchronous pair
•When the secondary data volume is updated after splitting URz pair
•As a result of the update of the primary data volume after splitting URz pair, when the capacity of the journal data exceeds 70% of the journal volume in TCz Synchronous secondary site
•When the primary data volume in the URz pair for delta resync operation is updated and then the capacity of the journal data exceeds 70% the journal volume in the primary site of URz pair for delta resync operation
•When no volumes (including volumes after failover or failback) in the primary site are updated after creating the URz pair for delta resync operation
•When delta resync operation is performed within about one minute after a volume in the primary site is updated after the URz pair for delta resync operation is created
Chapter 3 Preparing for Universal Replicator z/OS Operations |
