Advanced Copy Services comprises the following functions and enhancements. Mirror functions provide a consistent point-in-time copy of data at the recovery. The purpose of this publication is to help you understand and use IBM Advanced; Copy Services functions. It describes three dynamic copy. Abstract for DFSMS Advanced Copy Services. This information supports z/OS® ( ZOS) and contains information about Data Facility Storage Management.
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The process also includes adding new volumes or triggering a planned HyperSwap. Figure 13 is basically the same as Figure 10 on page 18; the only difference advanceed the IP-based connectivity between the servvices GDPS instances that execute in this environment. A current list of IBM trademarks is available on the Web at http: Consult your local IBM representative for information on the products and services currently available in your area.
The journal or D volumes are used by SDM only.
APPENDIX1.1 Appendix A. Advanced Copy Services Diagnostic Aids
The HyperSwap function is made possible through the Metro Mirror relationship. Shifting the connectivity usually is not very difficult, because a FICON-switched infrastructure might exist and the required connectivity might already be configured.
All Copy Services functions are handled within the DS firmware. Figure 2 shows a MzGM configuration. As the name implies, it consists of a Metro Mirror advancec and a zGM relationship.
“z/OS V1R DFSMS Advanced Copy Services” IBM Library Server
This information contains examples of data and reports used in daily business operations. The next operation is a PPRC suspend of the volume pair. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. High availability requirements have become as important as the need to quickly recover after a disaster affecting a data processing center and its services. Metro Mirror relationship between A and B Volumes A and B are in a synchronous copy services relationship and are the base for potentially swapping both devices through HyperSwap.
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PPRC QUERY SUSPEND(3)
The next step is an SDM internal swap operation to swap its primary volumes from volume A to volume B. The numbers in the figure correspond to these steps. We assume that the PPRC path exists in either direction, which is required for the swap operation to succeed.
During that time, in the course of reading changed records out of disk subsystem A, SDM cannot access the A volumes due to the freeze operation when the HyperSwap operation starts. Writes to SDM journal data sets on these D volumes. Depending on what happens to the disk storage subsystems in C, an incremental resync to the zGM session can be handled through the hardware bitmaps maintained in the zGM primary disk subsystem for each A volume.
IOS handles the swap activities and provides some error recovery when the swap cannot successfully finish. IBM has not tested those products and cannot confirm the accuracy of performance, compatibility or any other claims related to non-IBM products.
Over the past years, IT service providers, either internal or external to a company, exploited the capabilities of new developments in disk storage subsystems. Following this recommendation simplifies the handling of the configuration. Microsoft, Windows, and the Windows logo are trademarks of Microsoft Corporation in the United States, other countries, or both.
Volume B is the cascaded volume, and it has the following two roles: He has written many IBM Redbooks and has developed and taught technical workshops. Thanks to the following people for their contributions to this project: HyperSwaps can occur in a planned or an unplanned fashion.
Among other state and condition information, the UCB also contains a link to the path or group of paths needed to connect to the device itself. You must ensure that sufficient alias devices are available. At the same time, volume A is also primary to the zGM session, with volume C as the corresponding zGM secondary volume.
IBM, therefore, cannot guarantee or imply reliability, serviceability, or function of these programs. Combining Metro Mirror and continue with Global Mirror places the middle volume in a configuration that is known as cascaded.
This command starts the actual resynchronization. MzGM is a three-site multiple target configuration in a System z environment. In our example in Figure 4 on page 8, the reverse direction is from device to device Thus, you must create a new zGM session and perform a full initial copy between volume A and volume C.
This three-site mirroring solution is often simply called MzGM. We call it Basic because TPC-R does not provide anything beyond a planned swap trigger and avoids the entire swap process once a HyperSwap is triggered in an unplanned fashion.
Such trademarks may also be registered or common law trademarks in other countries. The following HyperSwap interfaces alternatives are available: IBM may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you.
Conceptually MzGM is a multiple target configuration with two copy relationships off the same primary or source device. These examples have not been thoroughly tested under all conditions.
At the same time, volume B is also the primary or source volume for volume C. The current volume set in C still represents a consistent set of volumes.
Figure 9 shows a schematic view of a GDPS-controlled configuration. However, this table is not a complete list of all the relevant points of comparison. TPC-R manages the following two routes to the disk storage subsystems: This swap operation leads first to a validation process to determine whether the primary and secondary PPRC Metro Mirror volumes are in a state that guarantees that the actual swap is going to be successful and does not cause any integrity exposure to the data volumes.
This quiescence operation is performed by the user.