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The different kinds of hardware upgrades have different impacts on your WebSphere environment. For example, if you are changing the disks of the machine and this requires reformatting the disks, then follow the procedure described in 4.3, Replacing hardware.
For systems such as the IBM eServer pSeries, iSeries, and zSeries, a disk capacity upgrade should not impact the running WebSphere processes because new disks can be added to the running system. Thus, they can be upgraded without stopping the node while the application is still available to users.
For other hardware upgrades, such as memory and processor upgrades, they are independent system processes and should not impact the configured WebSphere system, but might impact node availability itself for some platforms. A HA WebSphere system should always consist of multiple nodes so a failure or planned maintenance of one node does not impact the availability of the application. However, follow always the vendor's installation instructions to avoid unforeseen system problems.
Capacity on Demand (CoD) is the IBM solution designed to provide continuous availability for all major business applications, while providing dynamic system capacity growth and processor upgrade without causing hardware or software outages, activating and using the additional capacity are transparent to all applications. To learn about IBM CoD, visit the About Capacity on Demand site available at:
http://www.ibm.com/servers/eServer/about/cod/about/types.html
For more information about CoD for the different IBM platforms, click the appropriate links on the About Capacity on Demand start page.
