Suspend Types
Table
When a URz pair is suspended by the user, the primary storage system and secondary storage system ensure synchronization by either completing or discarding any pending update copy operations according to the
A URz pair is suspended by the primary storage system when the following suspension conditions are detected. A URz pair can also be suspended by the secondary storage system (see section Suspension Condition).
•When the primary storage system detects that the user has released the volume pair from the secondary storage system (e.g., to access an secondary data volume at the secondary site),
•When the primary storage system detects an error condition related to the secondary storage system, secondary data volume, or a URz journal data operation,
•When the secondary storage system cannot execute DFW (DASD fast write) to the secondary data volume (only if DFW required is selected), or
•When the primary storage system is unable to communicate with the secondary storage system.
For more information on URz journal data operations, see section Suspension Condition.
When a URz pair is suspended, the primary storage system stops performing update copy operations to the secondary data volume. Moreover, the primary storage system and secondary storage system keep track of any journal data that were discarded during suspension, and the primary storage system continues accepting write I/Os for the primary data volume and keeps track of the primary data volume tracks which are updated while the pair is suspended.
A suspended URz secondary data volume has an additional status called the consistency status which is displayed only at the secondary storage system. The consistency status of a suspended URz secondary data volume indicates its update sequential consistency with respect to the other secondary data volumes in the same group.
Table
When a URz pair is suspended, whether
Chapter 3 Preparing for Universal Replicator z/OS Operations |
