New 7310-CR4 Requires HMC V6R1.2
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The recently announced 7310-CR4 rack-mounted HMC requires HMC V6R1.2 Licensed Internal Code. The reason is that this model introduces new hardware to the product line, and device support exists only in the latest HMC code release. From the abstract in the announcement letter:
The IBM 7310 Model CR4 has a Dual Core Intel Xeon 5130, 4 MB Cache, 2.00 GHz, 1333 MHz front-side bus processor, 1 GB of system memory, 80 GB minimum HDD, 12.7 mm DVD-RAM for backup, DVD-RAM media: 4.7 GB single-sided DVD-RAM, type 2 media.
Note that there is no IBM requirement that every HMC in a customer's environment be at exactly the same level. Most customers probably prefer to maintain consistency, however, for the sake of simplicity. However, that does not mean you could not easily have some HMCs managing POWER5 or POWER5+ servers at V5R2.1, V6R1.1 and V6R1.2. Either updating (changes within a version) or upgrading (moving to a new version) can be done without bringing down the managed servers. The Web-based System Manager remote client that works with one will work with all levels, as well as with the HMCs controlling POWER4-based servers.