Read the full Q&A and watch the video for the SDxCentral NV Report Webinar sponsored by Avaya where experts elaborate on why network virtualization and SDN should reach further than the data center.
The main purpose of this work is to show results of benchmarking some of the leading in-memory NoSQL databases with a tool named YCSB.
We selected three popular in-memory database management systems: Redis (standalone and in-cloud named Azure Redis Cache), Tarantool and CouchBase and one cache system Memcached. Memcached is not a database management system and does not have persistence. But we decided to take it, because it is also widely used as a fast storage system. Our “firing field” was a group of four virtual machines in Microsoft Azure Cloud. Virtual machines are located close to each other, meaning they are in one datacenter. This is necessary to reduce the impact of network overhead in latency measurements. Images of these VMs can be downloaded by links: one, two, three and four (login: nosql, password: qwerty). A pair of VMs named nosql-1 and nosql-2 is useful for benchmarking Tarantool and CouchBase and another pair of VMs named nosql-3 and nosql-4 is good for Redis, Azure Redis Cache and Memcached. Databases and tests are installed and configured on these images.
Our virtual machines were the basic A3 instances with 4 cores, 7 GB RAM and 120 GB disk Continue reading
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Only a few years old, NFV passed some milestones in 2015.
Getting to the point where big is never big enough, one may think “What’s cooking?” Well, BGP in the DC is a subject that’s been under my radar for some time, so the purpose of this article is to get things a bit more straight-forward regarding the WHYs and HOWs.
A look in the past
First of all, we should ask ourselves who was Clos. Charles Clos started his work at Bell Labs, mainly focusing on finding a way to switch telephone calls in a scalable and cost-effective way. In 1953, he published the paper “A Study of Non-Blocking Switching Networks”, where he described how to use equipment having multiple stages of interconnections to switch calls.
The crossbar switches (you may think of them as common use switches with a defined number of ports) connected in a three-stage network (ingress, middle, egress) form the so called Clos network.
This had a pretty big use back in the 1950’s but once the level of circuit integration got to the point where interconnections would no longer be a problem, it was no longer of interest, at least for some time. Until huge scale data centers came to be needed (and Continue reading
It's been a year of learning about new products, new markets... and giraffes.
This website is a fantastic resource for Mac OS X Users. Hundreds of A curated list of shell commands and tools specific to OS X. “You don’t have to know everything. You simply need to know where to find it when necessary.” (John Brunner) https://github.com/herrbischoff/awesome-osx-command-line
The post Mac OS X : Collection of CLI tips appeared first on EtherealMind.
How many times have you received that call or even made the statement that “The Internet is Down?” Or perhaps the “Internet is Slow?” Obviously these statements are very rarely true. As a whole, the Internet is functional and it is FAST. However these statements seem true from the perspective of the individual making them. My frustration is that we never have visibility into the data necessary to assess the health of the Internet from a relevant, holistic perspective over time. As a result, consumers and providers have a limited view of problems that randomly present in this manner.
When I think about the impact Internet hiccups have on me, I realize that I could do things much differently if it delivered consistent reliability. Even if it wasn’t as reliable as infrastructures like the PSTN, having some semblance of trust in knowing when and how my connections might fail or degrade would help. The resulting improvements would allow me to use more robust tools like video and voice over the Internet and put my cell phone away. I can’t tell you how many times I’ve spent hours chasing ghosts. These transient issues tend to get resolved when they worsens and the root cause is more easily identifiable. Increasing the trust we have in our services would materially change the way in which we use them. Continue reading
Understanding everything about routing design is no brainer, especially if you have the chart below on your wall. The table below highlights the pros and cons of each routing protocol. Of course, you need to consider the design attributes shown in Figure A before embarking on routing design. Should you like the comparison of the […]
The post Routing design appeared first on Network Design and Architecture.
Sonus joins the Packet Pushers to talk about VellOS, a network operating system for ensuring quality of experience for unified communications. With VellOS you can automate flows through a network and control bandwidth, packet marketing, MPLS values, and more to guarantee high-quality voice and video calls.
The post PQ Show 69: Sonus VellOS And QoE For Unified Communications (Sponsored) appeared first on Packet Pushers.
Sonus joins the Packet Pushers to talk about VellOS, a network operating system for ensuring quality of experience for unified communications. With VellOS you can automate flows through a network and control bandwidth, packet marketing, MPLS values, and more to guarantee high-quality voice and video calls.
The post PQ Show 69: Sonus VellOS And QoE For Unified Communications (Sponsored) appeared first on Packet Pushers.
It was almost a year ago that I set forth the idea to start writing all my blog posts in Markdown. I’ve been doing my best to keep up with that throughout the year and now I’m fifty Markdown posts into my goal. How is it working out so far?
Learning to write in Markdown took some adjustment. Before, I had just used the web editor or the occasional HTML editing suite to write my posts. Most of the HTML was hidden. With Markdown, you have to think about what you’re going to do before you start writing it. Where are the links going to appear? How is your post going to be organized? Putting a bit more thought into your post gives you more structure to your thoughts. That’s something that’s helped my writing a bit.
The table layout for the 2015 Cisco Live Twitter List really wasn’t all that difficult either. Once I put the initial code together, it was just a simple copy/paste job after that. I’m toying with the idea of putting all my notes into Markdown as well. But given how terrible I am with taking typed notes that may not happen.
I was doing some testing on a 3750X and saw that the http and http servers were enabled. I knew you could apply an ACL to restrict HTTP access, but had assumed that the HTTP security was an optional extra on … Continue reading
The post VTY ACL doesn’t block HTTP/S access appeared first on The Network Sherpa.
I recently came across a design in which GRE tunnels were built utilizing HSRP VIP addresses. At first I was unsure of how well this would work so as usual I decided to lab it up. It turns out that this is an excellent counter design to having to place metrics or do any type […]
The post Fun with GRE and HSRP appeared first on Packet Pushers.
I recently came across a design in which GRE tunnels were built utilizing HSRP VIP addresses. At first I was unsure of how well this would work so as usual I decided to lab it up. It turns out that this is an excellent counter design to having to place metrics or do any type […]
The post Fun with GRE and HSRP appeared first on Packet Pushers.
