Intel 7xx Servers, 170 Servers, AS/400 RISC Server manual Geographic Mirroring Tips

Geographic Mirroring Tips

•For a quicker switchover time, keep the user-ID (UID) and group-ID (GID) of user profiles that own objects on the IASP the same between nodes of the cluster group. Having different UID’s lengthens vary on times.

•Geographic mirroring is optimized for large files. A large number of small files will produce a slower synchronization rate.

•The priority settings available in the disk management section of iSeries navigator can improve the speed of the synchronization process. The tradeoff for faster speed however is a higher CPU utilization and could possibly degrade the applications running on the system during the synchronization process.

•Multiple TCP lines should be configured using TCP routes. Failure to use TCP routes will lead to a single line on the target side to be flooded with data. For more information look on the IBM InfoCenter.

•If geographic mirroring is not being used, geographic mirroring should not be configured. Configuring geographic mirroring without actually mirroring your data consumes up to 5% extra CPU.

•Increasing the number of lines will increase performance and reliability

•Place the journal in an IASP separate from the database to help the synchronization process

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
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