HMC V4.5 Required for Current Power5 Microcode (SF230_145)
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be sure the HMC version is 4.5. This is required for the
current Power5 microcode (SF230_145, August 2005).
The new microcode/HMC versions support concurrent maintenance,
or the ability to do most microcode upgrades dynamically, without
having to take down partitions.
You can download the HMC update from