The combination B230-M1,ESXi5.1,UCSM 2.1.2a is not certified.
The combination B230-M1,ESXi5.1,UCSM 2.0.5 is.
Q. can I run Infrastructure at 2.1.2a, and the B230-M1 blade with a HF of 2.0.5, and the remaining M3 blades with HF 2.1.2a ?
Accoridng to the release notes this is supported, you will need to make sure that all of the components in the blade(s) are upgrade to the same version( see note below from the release notes)
Release Notes for Cisco UCS Software, Release 2.1
Starting with Software Release 2.1, the Cisco UCS Manager A bundle software (UCS Manager, NX-OS, IOM Firmware) can be mixed with previous release's B or C bundles on the servers (host FW, BIOS, CIMC, adapter FW and Drivers). A given server must be running the entire B-bundle, so mixing the 2.0(3a)B BIOS with the 2.0(4b)B CIMC is not supported. "
I know of course this document, however
>>>Starting with Software Release 2.1, the Cisco UCS Manager A bundle software (UCS Manager, NX-OS, IOM Firmware) can >>>be mixed with previous release's B or C bundles on the servers (host FW, BIOS, CIMC, adapter FW and Drivers).
I would like to know, what previous release's B or C bundles, means.
I belive this is what you are looking forhttp://www.cisco.com/en/US/docs/unified_computing/ucs/sw/firmware-mgmt/gui/2.1/b_GUI_Firmware_Management_21_chapter_01.html#concept_9F7E716C0D934BBD8CE5B035444F39C4
Cisco UCS supports cross-version firmware support in the following way:
For example, if you upgrade the infrastructure firmware to Cisco UCS, Release 2.1, you can have firmware on some or all of the servers in a Cisco UCS domain can remain at the most recent version of Cisco UCS, Release 2.0(4).Important:
If you implement cross-version firmware, you must ensure that the configurations for the Cisco UCS domain are supported by the firmware version on the server endpoints. For example, the minimum power budget for the servers must be no lower than the minimum supported in Cisco UCS, Release 2.0(4). The lower budget supported in Cisco UCS, Release 2.1 is not supported for servers that are running Cisco UCS, Release 2.0(4) firmware.
Thanks Manuel, I was aware of this. However, the document is not up to date.
Q: can this table be extended in the sense that
Infrastructure Firmware : 2.1.2a
Cross-Version Server Firmware: 2.0.5
I did some more research but apparently the 2.0(4) is the only release that is supported by the cross-version server firmware.