DS8870; DS8880; DS8884; DS8886; DS8888; TotalStorage Productivity Center for Replication
|Abstract: IBM DS8000 Multi Target PPRC & IBM Copy Services Manager White Paper|
|The IBM DS8000 storage products support various types of copy services which can be easily used to design two, three and four site replication solutions. In addition to the former Metro Global Mirror three site cascaded topology, the DS8870 and later models also support three site Multi Target PPRC topologies, which provide much more flexibility and can be combined with cascaded Global Copy or Global Mirror to compose a four site replication topology.|
IBM Copy Services Manager (CSM), or former TPC-R for Replication (TPC-R) is the central IBM software product to manage all the various types of copy services, not only for the DS8000, but also for the majority of other IBM storage products like the Storwize Family, XIV and Flash Systems.
While CSM supports three site replication topologies for DS8000, it does not have a built in Session topology for a cascaded four site topology yet. There are various concepts for a four site replication solution, mainly depending on the customer requirements. Nevertheless, CSM manages copy services in a way that allows to combine (cascade) multiple sessions which manage the same set of volumes in a specific role of those sessions. However, this introduces implications and limitations for CSM Session management and various Failover Failback scenarios that might be required.
This Whitepaper describes a specific four site replication solution and shows how this can be managed with a set of CSM Sessions, while preventing full copies when active CSM Sessions needs to be toggled with inactive sessions to manage specific scenarios in the reversed direction.
It also provides best practices how configuration changes can be managed in such an environment to avoid configuration mistakes in CSM, by leveraging CSM features such as volume protection, site awareness and session configuration export/import capabilities.
DS8000 Four site Replication management with CSM v1.0.pdf
Hardware; Software; Solutions
IBM System Storage
AIX; Linux; Windows Server 2008; z/OS
csm, replication, multi-target, ds8000, 4 site
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