Overview of Remote Site Recovery (RSR)


RSR is a separately priced feature available with IMS.

RSR can track details of IMS full-function databases and Fast Path DEDBs at an alternate site. The remote site is connected to the site with the active systems by a network connection using the VTAM APPC protocol. The VTAM connection is between separate IMS transport manager subsystems (TMSs) on the active and tracking machines.

The IMS logger component on the active machines sends the log data from all active IMS systems (DB/DC, DCCTL, DBCTL and batch) that are defined for RSR tracking to the tracking machine.

The TMS on the tracking machine receives this data and passes it to a single IMS region. This region processes the data and records it using normal IMS processing. Depending on what level of tracking has been requested, the IMS region might also apply the updates to the IMS databases.

If any interruptions to the network connection occur, RSR notes the gaps in the logging, obtains the missing log data, and performs catch-up processing when the link is reestablished.

The IMS system on the tracking machine normally can process only input from the TMS. The tracking machine only becomes a fully functioning system if it has to take over.

Not all databases are tracked. You define the databases that are tracked when you register them to DBRC.

Related Reading: For more information about RSR, see IMS Version 9: Administration Guide: System.



Introduction to IMS. Your Complete Guide to IBM's Information Management System
An Introduction to IMS: Your Complete Guide to IBMs Information Management System
ISBN: 0131856715
EAN: 2147483647
Year: 2003
Pages: 226

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