Error on Cisco UCS pinning training
A quick heads up, Cisco have been teaching everyone the wrong thing on the pinning of UCS.
A lot of people have been going on the Cisco Unified Computing System Bootcamps, such as myself, Scott Lowe, Rich Brambley and Brian Knudtson.
One of the important things they teach you is about the pinning, a big deal is made about it in the class (well mine anyway). Here is the page from the course notes, sorry about my scribbles.
The most common implementation will be 2 links from the IOM to the F-I. I have been testing in the lab this week the pining, how to re-pin, how long it takes. Was planning on writing it all up. However one thing I have noticed is that the pinning was all backwards.
Beware its the opposite to what they teach.
When you have 2 uplinks it actually works like this
Port 1 on the IOM goes to the ODD (not even) blades, thats 1,3,5,7.
Port 2 on the IOM goes to the EVEN (not odd) blades, thats 2,4,6,8.
When doing your design for load balancing and failure procedures things like this do matter and I am a little annoyed that Cisco could get this wrong.
I thought it may have been a problem with the early course notes, but I contacted Brian Knudtson via twitter a few minutes ago who just happened to be sitting in a bootcamp as I type, he checked the current notes, still wrong.
Its obviously an error in the technical editing but I can't believe it has not been picked up. Cisco, please update your documentation and train people right. I will also go through some official channels to get it fixed.
More details on pinning thing to come, when I finish my testing and analysis. Lucky I don't believe what I read!
[UPDATE] Note that page 166 of the "Project California" book has a table that gets this right, its in the section "Redwood IO_MUX" (Thanks to David Chapman for pointing this out). There is also a very interesting statement "In future releases the configuration of slot pinning to an uplink will be a user configurable feature." Sounds interesting. Now that I know a lot more about UCS I may go back and read the whole black book again, my first reading was days after the book was released, I may pick up a pile of new things this time round.
P.S. Sorry if I sound annoyed, I have been passing this info on to many people, and I don't like having to go back on my statements or look stupid. I now need to go and update all of my UCS diagrams I have been spreading around (which detailed the pinning). Like finding the boot order bug, this is why we doing testing.