Journal Group
The URz journal groups have the following requirements:
•Each URz pair must be assigned to one and only one journal group. Table
Table 3-9 Journal Group Specifications
Item | Support specifications |
|
|
Number of journal groups | Up to 256 journal groups (No. 0 - 255) per one disk subsystem | |
Note: The recommended number of journal groups is up to 16. | ||
| ||
|
| |
Number of data volumes in a journal | Up to 4,096 | |
group |
| |
|
| |
Number of journal volumes in a journal | Up to 64 | |
group |
| |
|
| |
Number of Mirror IDs | Up to 4 (ID No.: 0 to 3) | |
| Note: If TCz Sync. uses No. 0, No. 1 to 3 are available for URz. |
The same number of journal volumes is not required in the master journal group and the restore journal group that are paired.
Mirror ID is required for the configuration that will be supported in the future within the
•Table
Table 3-10 Journal Group Volume Specifications
Item
Support specifications
Emulation | Same emulation type. |
type |
|
|
|
Volume | Does not matter whether the capacity is the same or different. |
capacity |
|
|
|
CLPR | Journal volumes and data volumes in the same journal group can belong to different CLPRs. |
| Journal volumes must belong to the same CLPR. Data volumes must also belong to the same |
| CLPR. |
| Note: A primary journal group and the corresponding restore journal group need not belong to the |
| same CLPR. |
|
|
Note: When URz and UR coexist in the same USP V storage system, each journal group must contain either URz pairs or UR pairs (not both).
Chapter 3 Preparing for Universal Replicator z/OS Operations |
