TCP/IP Redundancy with Virtual Ethernet in IBM i

Support for Ethernet Link Aggregation, as previously featured in the i Can blog “Ethernet Link Aggregation in IBM i” and the tip IBM i Aggregate Ethernet Lines on IBM developerWorks was added to IBM i in the 7.1 release. An aggregate line description combines multiple physical Ethernet ports. The line description can then be used for TCP/IP configuration just like any other line description, but the incoming and outgoing traffic will be spread among the available ports. As a side benefit, the line description will remain active as long as any of the aggregated ports are available.

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Ethernet Link Aggregation in IBM i

In 7.1 Technology Refresh 3, IBM i added the capability to aggregate multiple Ethernet ports in one Ethernet line description. An aggregated line description offers two significant benefits over a single-resource line description: improved reliability and parallel throughput.

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Display the Status of Your IOA Cache Batteries

I assume most of you are familiar with the I/O adapters that have cache batteries on them and the importance of monitoring the status of those batteries to ensure they are replaced before they fail. In case you’re not: the IOA has a cache to improve performance; the application doesn’t have to wait for the data to be written to the disk. The cache is powered by a battery in the IOA to ensure the cache data is preserved even if the IOA is powered off or reset. However, if the cache battery is failing, then the data is written directly to disk and the cache isn’t used, which can result in significant performance degradation. As such, you should know when the cache batteries are failing to get them replaced before it affects your application’s performance.  

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Use POWER7 Features with IBM i 6.1.1

This blog reviews a few of the key features of POWER7 that were initially supported in the IBM i 6.1.1 release. While this blog is a bit dated, some of the key concepts of SMT, energy management, and processor frequency remain applicable to current current generations of POWER hardware and IBM i releases. Links have been updated to reference current information on these topics.

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