The legendary author, Dr. Seuss, (the real-life Theodor Geisel), created his own language in his children’s book, On Beyond Zebra. When you read it, you’ll find a fantastic new world of ridiculously entertaining terms to represent the imaginary alphabet after the letter Z. It’s a delightful rhyming nonsensical collection of words — "yuzz" and "wum" and "thnad" and "humpf" and "zatz-it," to name a few — all of which come together to make a story line you’ll love. 

(I’ll bet you know where I’m going with this…) In the world of IT and data-center infrastructure, we, too, have our own ridiculous language. In the mission-critical server arena, we’ve even created our own dialect.

So let’s waltz off to Mission-Critical Server Land, to get an understanding of Lenovo servers in hand. DIMMS and books will get us on track and as for form factors, we’ll mention both the blade and the rack. We’ll describe advanced RAS with glee, and as we explain these terms, we might even throw in eXFlash for free. In future editions we'll add other terms for good measure, so much so that we bet that you’ll learn more about Lenovo X6 with pleasure!

X6: (Not a James Bond agent)

Our definition: a Lenovo family of fast, agile, resilient scalable mission critical rack and blade servers. X6 servers are characterized by exceptional performance, differentiated design and advanced RAS features. All of that equals business value for customers. See also x3850 X6, x3950 X6, Flex System x480 X6 Compute Node and Flex System x880 X6 Compute Node

BOOK: (Not a literary work)

Our definition: easy-to-install, preconfigured modules related to each of the subsystems in X6 rack servers (Compute Books, Storage Books, I/O Books). Books slide into and out of the X6 rack server chassis in much the same way books are inserted into a bookshelf. See more in the animated demo here. (Click on 360 degree icon.)

RACK: (Not the ribs and BBQ sauce served in NC restaurants)

Our definition: the form factor of two of the mission critical X6 servers – the x3850 X6 and the x3950 X6. Different from typically-designed rack servers, X6 racks are modular, with the blade-like characteristic of having replaceable books that slide in and out. Noteworthy is the fact that each book (module) in an X6 server IS NOT a separate server whereas in a blade server, each blade can operate as an independent server.

BLADE: (Not the sharp end of a knife)

Our definition: the form factor for the Flex System x480 X6 Compute Node and Flex System x880 X6 Compute Node. The server chassis houses multiple blades -- thin, modular electronic circuit boards, Each blade can operate as an independent server.

RAS: (Not what people do to you when you say something stupid)

Our definition: reliability, availability, serviceability. In the case of Lenovo Mission-Critical X6 servers, it’s advanced RAS. Reliability = propensity for a system to produce correct outputs. Availability = system uptime. Serviceability = ease of repair and maintenance. Read more here. Watch the video here.

Enterprise: (Not the spacecraft from Star Trek(1))

Our definition: An organization comprised of multiple operating units, products lines, and/or functions, yet joined by a common corporate structure for managing personnel, information, measurements, and key services

Mission Critical: (Not the first cousin to Mission Impossible(2))

Our definition: Mission Critical” refers to applications, workloads or services that are crucial to the day-to-day operations of a business. x3850 X6, x3950 X6, Flex System x480 X6 Compute Node and Flex System x880 X6 Compute Nodes all are part of the Lenovo Mission Critical Portfolio.

DIMM: (Not an adjective that comes before “bulb”)

Our definition: dual in-line memory module; a kind of memory.(3) With X6 mission-critical servers, we talk about traditional DIMMs and eXFlash DIMMs. Also click here.

Flash: (Not a quick burst of light)

Our definition: the technology contained on a solid-state drive (also known as flash memory). Examples for X6 servers include NVMe and eXFlash memory channel storage.

(1) Wikipedia,, (August 10, 2015)

(2) Wikipedia,, (August 10, 2015)

(3),, (August 9, 2015)

Original art by Kathy Holoman