Ordering the Correct HMC Model
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The 7042 machine type is for HMCs running Version 7. This Licensed Internal Code is a requirement for managing POWER6 servers, such as the 9117-MMA. However, it will also support POWER5 and POWER5+ managed servers.
The 7310 machine type is for HMCs running Version 6. You cannot manage a POWER6 server using this HMC code. It is for POWER5 and POWER5+ managed servers only.
Many 7310 HMCs can be upgraded in the field to support HMC V7 Release 3 code. However, the reverse is not true. IBM does not support changing a 7042 HMC to support HMC V6 Licensed Internal Code. Attempting to load HMC V6 LIC on a 7042 will produce an error message and the installation will be blocked.
In current models, the only difference between the two machines is a feature code that specifies which code to install. The hardware is identical. Feature code #0961 drives shipment of HMC Version 6 with the HMC. Feature code #0962 drives shipment of HMC Version 7.
To avoid delays, be sure you know which HMC code environment you want before ordering your HMC.