Group | This URz volume pair was suspended along with the other pair in its journal group. Update | |
| sequence consistency between this secondary data volume and other secondary data | |
| volumes in this journal group is ensured. This secondary data volume can be used for disaster | |
| recovery at the secondary system (after releasing the URz volume pair from the secondary | |
| storage system). This status is indicated when: | |
| – | This volume pair was suspended by a |
|
| URz Suspend option set to Group. |
| – | All volume pairs in this journal group were suspended due to a failure that affected |
|
| the entire journal group (not just one pair) (e.g., primary storage |
|
| storage system communication failure). |
| – | The volume pair was suspended due to a failure that did not affect the entire group. |
|
|
|
Suspension Condition
URz operations also involve suspension conditions related to asynchronous operations. Both the primary storage system and secondary storage system can detect URz suspension conditions and suspend URz pairs.
The URz suspension conditions described in Table
Table 2-7 URz Suspension Condition
Suspension Condition
Detected by:
URz Pairs to be Suspended
The secondary storage system could not copy the | RCU | All URz secondary data volumes in the | |
journal data successfully due to a hardware failure or |
| journal groups, or the affected | |
logic error. |
| secondary data volume. | |
|
|
| |
The secondary storage system detected a logical error | RCU | All the URz secondary data volumes in | |
while selecting the journal data to be restored. |
| the journal group, or only the affected | |
|
| secondary data volume, depending on | |
The secondary storage system could not restore the | RCU | ||
the type of failure. | |||
journal data due to a hardware failure, track condition, |
| ||
|
| ||
or logical error. |
|
| |
|
|
|
The primary storage system stores the differential bitmap per URz primary data volume in the shared memory. The secondary storage system stores the differential bitmap per URz secondary data volume in the shared memory. When a URz pair is suspended, the tracks which contain the following journal are marked in the differential bitmap as modified (to be copied during the resume pair operation):
•The journal data that were created by the primary storage system but not yet sent to the secondary storage system.
After marking these primary data volume tracks as modified, the primary storage system discards these journal data.
•The journal data that were sent to the secondary storage system but not acknowledged by the secondary storage system.
Chapter 3 Preparing for Universal Replicator z/OS Operations |
