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 following HyperSwap interfaces alternatives are available: The next step is an SDM internal swap operation to swap its primary volumes from volume A to volume B. 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. To illustrate them as completely as possible, the examples include the names of individuals, companies, brands, and products.
CONTENTS “z/OS V1R DFSMS Advanced Copy Services” IBM Library Server
However, this is a drawback for the zGM session, because it does not follow the HyperSwap in an incremental fashion, which shifts its primary volumes automatically from A to B. Changed tracks are only masked in this bitmap and are not copied.
You must ensure that sufficient alias devices are available. The benefits of zGM when compared to GM include the requirement for less disk space zGM requires only a single copy of the database at the remote site, compared to two copies with GM and greater scalability zGM can handle much larger configurations than GM.
MzGM is a three-site multiple target configuration in a System z environment. In the present discussion, we are still referring to Basic HyperSwap, even when describing the process of incrementally swapping back to the original configuration.
In this context we recommend you configure the implicated disk storage subsystems to be identical as possible in regard to base volumes and alias volumes.
The HyperSwap function is made possible through the Metro Mirror relationship. Both relationships copy from the same primary or source volume but to different secondary or target volumes. Volume B is the secondary or target volume for volume A. TPC-R manages the following two routes to the disk storage subsystems: The next operation is a PPRC suspend of the volume pair. We call it Basic because TPC-R does not provide anything beyond a planned swap trigger and avoids the dfsme swap process once a HyperSwap is triggered in an unplanned fashion.
2.1 Chapter 2. What is Remote Copy?
Such trademarks may also be registered or common law trademarks in other countries. The furnishing of this document does not give you any license to these patents. All Copy Services functions are handled within the DS firmware.
Slide 1 – Western Cape Government. He holds a degree in electrical engineering. The following paragraph does not apply to the United Kingdom or any other country where such provisions are inconsistent with local law: The zGM session suspends. 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. The distance between the metropolitan sites and the remote site is not limited when replicating volumes through zGM.
However, it is the user’s responsibility to evaluate and verify the operation of any non-IBM product, program, or service. These examples have not been thoroughly tested under all conditions.
Abstract for DFSMS Advanced Copy Services
Depending on what happens to the disk storage subsystems in C, an incremental xopy to the zGM session can be handled through the hardware bitmaps maintained in the zGM primary disk subsystem for each A volume. We assume that the PPRC path exists in either direction, which is required for the swap operation to succeed.
At the same time, volume B is also the primary or source volume for volume C. A first step is most likely the HyperSwap operation itself. In this configuration, the following differences exist between these two management approaches: During normal operations, no software is involved in driving this configuration. In Figure 9, this system, SY1P. Dfsmss current volume set in C still represents a consistent set of volumes. However, the failure of volume B disables the HyperSwap function.
You can send license inquiries, in writing, to: The process service includes adding new volumes or triggering a planned HyperSwap. As a result, new zGM session has serbices be created between B and C. Over the past years, IT service providers, either internal or external to a company, exploited the capabilities of new developments in disk storage subsystems.
Thus, you must create a new zGM session and perform a full initial copy between volume A and volume C. All of these names are fictitious and any similarity to the names copu addresses used by an actual business enterprise is entirely coincidental.
Allocate journals as striped data sets across two devices.
Any references in this information to non-IBM Web sites are provided for convenience only and do not in any manner serve as an endorsement of those Web sites. This quiescence operation is performed by the user. This list is derived from observation and analysis over time of situations without HyperSwap support that had the potential of Parallel Sysplex outages or that actually caused an outage.
This initial copy might run for several hours, and if any error occurs with the Servies volumes before the initial copy is completed and with all zGM volume pairs in DUPLEX state, the remote site has consistent source data volumes in D to restart.
DFSMS Advanced Copy Services
You may copy, modify, and distribute these sample programs in any form without payment to IBM, for the purposes of developing, using, marketing or distributing application programs conforming to the application programming dfssms for the operating platform for which the sample programs are written.
This information could include technical inaccuracies or typographical errors. This action contributes to high availability and even to continuous availability when performing a HyperSwap in a planned fashion for whatever reasons, and there are plenty of reasons.