Conﬁgurations, GDPS/Global Mirror - preview

This innovative disaster recovery solution requires GDPS, IBM Tivoli System Automation for Multiplatforms, Linux on zSeries, and z/VM 5.1 and is designed to help anticipate and rapidly respond to business objectives and technical requirements while maintaining high system availability.

Performance enhancements for GDPS/PPRC and GDPS/XRC

conﬁgurations

•Concurrent activation of Capacity Backup Upgrade (CBU) can now be performed in parallel across multiple servers, which may result in an improved RTO. This improvement may apply to both the GDPS/PPRC and GDPS/XRC conﬁ gurations.

•In a GDPS/XRC conﬁ guration, it is often necessary to have multiple System Data Movers (SDMs). The number of SDMs is based on many factors, such as the number of volumes being copied and the I/O rate. Functions are now capable of being executed in parallel across mul- tiple SDMs, thus helping to provide improved scalability for a coupled SDM conﬁ guration.

•Analysis has shown that PPRC commands issued by GDPS will generate a large number of Write to Operator messages (WTOs) that may cause WTO buffer short- ages and temporarily adversely impact system perfor- mance. The Message Flooding Automation function is expected to substantially reduce the WTO message trafﬁ c and improve system performance by suppressing redundant WTOs.

GDPS/Global Mirror – preview

IBM Global Services plans to make available a new service, GDPS/Global Mirror, to support the recently announced IBM TotalStorage Enterprise Storage Server (ESS) remote copy function called IBM TotalStorage Global Mirror. Global Mirror is included in Peer to Peer Remote Copy (PPRC) Version 2, and is designed to enable a two- site disaster recovery and backup solution for the zSeries and open systems environments.

Using asynchronous technology, Global Mirror operates over high-speed communication links and is designed to maintain a consistent and restartable copy of the data at a recovery site that can be located at virtually unlimited dis- tance from the application site.

GDPS/Global Mirror executes in both the application and the recovery sites. It manages the Global Mirror remote copy function, and automates the restart of the workload in the recovery site in case of a disaster in the application site. GDPS/Global Mirror has the capability of managing multiple Global Mirror sessions. The multiple sessions could be the data mirroring of multiple sysplexes or Open systems or even single image z/OS systems.

The initial delivery of GDPS/Global Mirror will support zSeries data. A future release will provide support for open systems data.

These GDPS enhancements are applicable to z800, z900, z890, and z990. For a complete list of other supported hardware platforms and software prerequisites, refer to the GDPS executive summary white paper, available at: ibm.com/server/eserver/zseries/pso.

Automatic Enablement of CBU for GDPS

The intent of the GDPS (CBU) is to enable automatic man- agement of the reserved PUs provided by the CBU feature in the event of a processor failure and/or a site failure.

Upon detection of a site failure, GDPS will dynamically add PUs to the conﬁ guration in the takeover site to restore pro- cessing power for mission-critical production workloads.

GDPS-CBU management helps to minimize manual cus- tomer intervention and the potential for errors, thereby helping to reduce the outage time for critical workloads from hours to minutes. Similarly, GDPS-CBU management can also automate the process of dynamically returning the reserved CPs when the temporary period has expired.