Network Break 118: Cisco Meraki Targets MSPs; A VMUG Spat
The latest Network Break looks at Cisco Merakis efforts to court MSPs, gives an update on the Ericsson-Cisco partnership, tracks container growth & more. The post Network Break 118: Cisco Meraki Targets MSPs; A VMUG Spat appeared first on Packet Pushers.How I Relearned the Consequences of Improper Monitoring
I had just lost the RAID array that hosts my ESXi data store. I didn’t yet know that’s what had happened, but with some investigation, some embarrassment, and a bit of swearing, I would find out that an oversight on my part three years ago would lead to this happening.
I first realized there was trouble when every VM on the host became unresponsive. Most notably, the Plex Media Server fell off the network which caused the episode of Modern Family that we were watching to immediately freeze. What was odd to me is that while the VMs were unreachable, the ESXi host itself was fine. I could ping it, ssh to it and load it up with the vSphere client. The first wave of panic hit me when I found messages like this in the host’s event log:
This was quickly confirmed from the ssh shell by looking for the data store and finding that a) the symlink for the volume (RAID1) pointed to a non-existent directory and b) the reported size of the volume was a paltry 450MB compared to the 930GB I expected.
Since I knew from prior experience Continue reading
Show 322: Can We Put An End To Stupid Network Tricks?
Engineers are often compelled to do stupid network tricks to overcome application design issues. These tricks introduce fragility and dont fix underlying problems. Can we stop? The post Show 322: Can We Put An End To Stupid Network Tricks? appeared first on Packet Pushers.
Keeping the Cisco CCDE exam secure !
One of the most important thing about CCDE exam is security. We all think that it is secure, it is not cheatable. There is no CCDE dump. We all believe that. CCDE exam has been around for more than 8 years and there are still only less than 400 people in the world. It seems […]
The post Keeping the Cisco CCDE exam secure ! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Worth Reading: the Mythical Man-Month
I was discussing a totally unrelated topic with Terry Slattery when he mentioned a quote from the Mythical Man-Month. It got me curious, I started exploring and found out I can get the book as part of my Safari subscription.
Read more ...How I Relearned the Consequences of Improper Monitoring
I had just lost the RAID array that hosts my ESXi data store. I didn't yet know that's what had happened, but with some investigation, some embarrassment, and a bit of swearing, I would find out that an oversight on my part three years ago would lead to this happening.
Book Report: Machete Season
Overview
Jean Hatzfeld’s Machete Season: the Killers in Rwanda Speak is a much different book than the Pol Pot history that I covered a couple of weeks ago. It’s harder to write about, because it’s just what the title describes: the killers in their own words, interspersed with short contextual explanations of the events surrounding the Rwandan genocide.
Hatzfeld – who has also written two books about the horrific Baltic wars of the 1990s – argues that many of what the mainstream media call genocides should be described as war crimes instead: brutal, unacceptable mass killings of defenseless humans that nonetheless take place in the the context of reducing a population’s ability to wage war. Genocide, he argues, is a term that should be reserved to describe an effort to completely exterminate a population and leave it incapable of ever recovering. In the Rwandan genocide, for example, the Hutu killers often preferred to murder women and children first, because it would leave the Tutsi population less capable of carrying on to the next generation.
History
Modern Rwanda has three main ethnic groups: the majority Hutu, the minority Tutsi, and a small population of Twa jungle-dwelling hunter-gatherers. At the time of Continue reading
Arris in bid for Brocade network unit: sources | Reuters
Arris wants to buy the Ruckus wireless business.
Arris is looking to buy Brocade’s network edge business, which is the most valuable of the assets being sold, according to the sources. Arris is not in talks to buy other parts of the business being divested by Brocade that include data centers, switching and software, the sources added.
Apparently talks to buy other parts of the business in whole or part are not working out.
Broadcom had divided up Brocade’s divestiture into three pieces after an earlier deal to sell the whole business to a private equity firm fell apart late last year, according to the sources. A private equity firm could still step up to buy all three pieces, the people said.
Arris in bid for Brocade network unit: sources | Reuters
The post Arris in bid for Brocade network unit: sources | Reuters appeared first on EtherealMind.
Response: Codec 2 700C | Rowetel
Acceptable quality open source voice codec in 700 bps
My endeavor to produce a digital voice mode that competes with SSB continues. For a big chunk of 2016 I took a break from this work as I was gainfully employed on a commercial HF modem project. However since December I have once again been working on a 700 bit/s codec. The goal is voice quality roughly the same as the current 1300 bit/s mode. This can then be mated with the coherent PSK modem, and possibly the 4FSK modem for trials over HF channels.
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Response: Site Reliability Engineering – Medium
Four rules for SRE:
- Always Know When It’s Broken
- Avoid Global Changes
- Moving Traffic Is Faster Than Fixing
- Make Your Mitigations Normal
Good rules, can’t argue with this as starting point. The devil in the detail of all of these and Enterprise IT does none of them.
Site Reliability Engineering – Medium:
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