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Profile of David Greenfield

Technology Writer
Blog Posts: 63



Articles by David Greenfield

7 Modeling Tools To Help Assess Cloud ROI
01/08/2013

Cloud services promise faster deployment and more flexibility, but if you want your CFO to back your cloud gambit, show her a solid financial analysis–preferably one with a good ROI. Here are 7 tools that can help.

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Disaster Recovery Lessons You Might Have Missed
11/27/2012

Hurricane Sandy had a lot to teach technology professionals about disaster recovery and business continuity. It certainly reinforced the basics—back up your data and test your DR systems—but there are other lessons to learn. Here are five.

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BufferBloat And The Collapse Of The Internet
04/21/2011

It seems that every few years there's yet another prognosticator that the Internet is about to collapse. Once it was the stellar growth in bandwidth demand driven by the phenomenal increase in Internet-connected devices. At other times, it was the lack of Net neutrality (see this video). Still other times, it was sinister attacks on BGP or the fact that we've run out of IPv4 addresses.

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Welcome To The WAN Optimization Shell Game
04/11/2011

In the early days of Ethernet switch vendors, IT organizations would routinely hear vendors profess to deliver better line rate performance at 20 percent less than the market leader. The catch, because there was always a catch in this industry, was that performance was only achievable in specific circumstances. Turn on port monitoring or enable encryption and Ethernet switch performance would skid to a halt. A similar story may be brewing in the...

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The Importance Of Correcting Packet Loss In VDI
03/30/2011

Recently, on the LinkedIN WAN optimization professionals group, I participated in a conversation around whether virtual desktop infrastructure (VDI) is ready for the WAN. Face it, delivering responsive VDI over the WAN is going to be a challenge. One of the interesting points that came up was the importance of correcting for packet loss when considering WAN optimizers.

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What WAN Optimizers Can Learn From Firewalls
03/11/2011

Listening to the give and take about WAN optimizers made me remember another battle between networking giants. It was nearly 10 years ago, during the early days of firewalls, when it seemed Marcus Ranum, then with Network FlightRecorder, would go head-to-head with Check Point's Gil Schwed on a weekly basis. Ranum was among the early creators of the application proxy and was vociferous about the value of delivering a firewall that terminated and...

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The First IPv6 WAN Optimizer: Speed At What Price?
02/16/2011

Last week, Blue Coat upgraded its MACH5 to become the industry's first IPv6-compatible WAN optimizer. WAN optimizers have long supported tunneled IPv6 over IPv4, but the MACH5 is the first WAN optimization appliance to accelerate native IPv6--and then some. The MACH5 is actually a very sophisticated IPv6 application layer gateway (ALG), providing IPv6 connectivity, security and optimization in a single device. Yet it's precisely its...

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WAN Optimization and the VDI Challenge
02/14/2011

I was sitting in on a peer-to-peer exchange about virtual desktop infrastructure (VDI) hosted by Wikibon and listening to how great VDI is for organizations. I asked about multisite VDI and what recommendations people had for implementing VDI between sites. The speaker paused and said that she hadn't see any multisite implementations. No surprise there. VDI itself is still in its infancy, but it hit me once again that if organizations are going...

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Data Centers: The Next Frontier For WAN Optimizers?
01/06/2011

Signs of the increasingly pivotal role that WAN optimization is playing in the enterprise can be seen in the emergence of hybrid cloud architectures within corporate networks. As Mike so poignantly pointed out in his blog, the simple ability to run a VM does not make an application ready for the cloud. If developers are to leverage on-demand services, such as Amazon's EC2, they need to rethink how they architect their software to leverage a...

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Big Data: Store Everything And Watch Storage Grow
11/17/2010

One of the big stories from the Teradata Partners conference that just finished up in San Diego was the huge advantage that retailers gain by the tracking the buying actions of their customers online and the enormous impact that's going to have on your storage assets in the years ahead. Business managers can't predict what questions they want to ask about their customers and can't say which collected data is useful or not. The answer is to store...

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What's Right And Wrong About IOV On The Motherboard
10/21/2010

Two months ago we were talking about when IOV would make it to the motherboard. Representatives from Xsigo played down the whole concept, arguing it was still premature . Perhaps they were right, or perhaps it was just misdirection on the part of Jon Toor, vice president of marketing at Xsigo, because buried in the details of HP's new server introduction, the SL6500 was IOV on the motherboard. The back and forth illustrates what's right and...

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The Skype-Avaya Matchup May Transform The Call Center
10/04/2010

Avaya and Skype have announced a joint integration that makes Skype services available on a variety of Avaya platforms. Under the terms of the relationship, Avaya customers in the US will be able to make global calls via Skype right from their Avaya communications system. This is good news for enterprises today because the partnership can help them cut costs. In the long term, it may be even better news for contact centers because it will...

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Avaya Flare: Eye Candy For Your CEO
09/24/2010

Collaboration pundits got their drool opportunity last week with the introduction of Flare, Avaya's new communication tablet. For IT pros, Flare's real impact may have less to do what happens while in the hall and more at the desk. The Flare Experience, as Avaya calls is, a new kind of interface that will initially be available on the Avaya Desktop Video Device. Think of it as an iPad for business users.

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Google's Enterprise Communications Play
08/27/2010

Enterprise IT professionals have reputations as curmudgeons who can cite 32 reasons why deploying a particular codec won't work on a particular link, or why choosing that particular application isn't the smartest thing to do (aka a really dumb thing to do). But have we missed the mark by being skeptical of Google's communication revolution? Surely you've had to field questions like "Why can't we just use Google Docs?" or "Can't I just run GTalk...

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Considering Skype For The Enterprise
08/17/2010

I recently wrote about how Skype is going to be using the revenue generated from the IPO to attack the business market. The company does a good job highlighting its penetration into fringe business cases--mobility and international calling--and emerging business cases, such as video calling, but perceptions of Skype as prone to security and other problems have been a barrier to enterprise-grade use. Should you consider Skype for enterprise-wide...

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IPO Fueling Skype's Business Play
08/11/2010

Reading about Skype's IPO filing on Gigaom reminded me of a conversation that I and Michael Osterman had with David Gurlé, the general manager for Skype for Business in June. Gurlé was in France at the time when we caught up with him, and we spoke about the Skype's future in the business market. He was bullish, as you'd expect, about their prospects to penetrate business, and went through detailed plans on how Skype for Business would succeed...

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Alcatel-Lucent Goes SIP Crazy
02/15/2007

Behind the discussions of innovation and enterprise-focus that permeated the keynotes and speeches here at the Alcatel-Lucent enterprise forum in Paris, the company demoted the SIP focus that will occupy much of is innovation this year....

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