Ethan Banks Not writing about IT.

CategoryConcepts

Production Designs Are Compromise – And That’s Okay

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During a bout of stress & jet lag induced insomnia, I logged onto Twitter in the wee hours to see what folks were saying. I found a number of twitpisses in my timeline. Twitpisses are arguments in which people assert that Someone On The Internet Is Wrong in 140 characters or less. After said assertion, a debate is held, using one of the worst platforms for intelligent discourse imaginable...

What is the difference between throughput & goodput?

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Throughput Throughput is the rate at which data is traversing a link. For example, take a look at the virtual router output below. The throughput rate is 643Kbps in each direction. CSR1KV01#show interface gi1 | include rate 30 second input rate 643000 bits/sec, 58 packets/sec 30 second output rate 643000 bits/sec, 58 packets/sec CSR1KV01# Goodput Goodput is the rate at which useful data traverses...

What is a data center operating system (DCOS)?

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I’ve become aware of a new industry term called the “Data Center Operating System” (DCOS). The big idea seems to be abstracting away individual elements of the data center, allowing compute nodes to get spun up on top of infrastructure building blocks, whether physical or cloud. In theory, you supply hardware or cloud resources, light up your DCOS, and thereafter interact with the DCOS to do all...

What does “scale out” vs. “scale up” mean?

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When researching data center network architectures, you will find the terms “scale out” and — rather less frequently — “scale up” used. What do these terms mean? I’m going to discuss these terms in a networking sense. If you search, you’ll find that applications and storage also have concepts of scaling out vs. up. Those other areas use the terms in similar ways, although the...

The Importance of Knowing Baselines

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When observing network utilization (whether that’s bandwidth or some other element you monitor), you have to know your baseline. The big idea is to understand what’s normal for your network, as every network is a little different. Only when you know your network’s baseline does it become possible to detect anomalies. For example, when monitoring bandwidth, some traffic spikes are...

The Principle of Same-Same in Physical Network Design

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In modern network architecture, most designs are redundant, often all the way through. Hosts uplink to two different ToR switches. Those ToR switches usually have two uplinks to a distribution layer or potentially more uplinks in leaf-spine designs. Spine switches uplink to a pair of core switches. Physical firewalls are deployed as clusters. Multiple connections are made from an organization to...

The Ethernet Switching Landscape – Part 08 – SDN & OpenFlow

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This is one of a multi-part series on the Ethernet switching landscape I wrote to support a 2-hour presentation I made at Interop Las Vegas 2014. Part 1 of this written series appeared on NetworkComputing.com. Search for the rest of this series. Ethernet switches have been a focal point of software defined networking. As some early SDN use-cases have centered on the data center, this makes sense...

The Ethernet Switching Landscape – Part 07 – Data Center Interconnect (DCI)

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This is one of a multi-part series on the Ethernet switching landscape I wrote to support a 2-hour presentation I made at Interop Las Vegas 2014. Part 1 of this written series appeared on NetworkComputing.com. Search for the rest of this series. One of the more specialized featured that appears in a limited number of Ethernet switches is Data Center Interconnect (DCI). DCI is not a protocol, but...

Ethan Banks Not writing about IT.

You probably know Ethan Banks because he writes & podcasts about IT. This site is his, but covers other stuff.

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