David Greenfield

Technology Writer

Articles

Why We Need Self-Healing SD-WANs

November 30, 2018

Organizations need to build the necessary intelligence into their SD-WAN to anticipate problems and take corrective action. Only then will SD-WANs continue to work when outages come.

Data Centers

VMware VSAN: Intriguing But A Ways Off

David Greenfield

September 09, 2013

IT managers may be excited about VMware's new virtual storage product, but they aren't necessarily ready to run out and buy it when it becomes available.

Data Centers

WAN Optimization Part 3: Overcoming Bandwidth Limitations

David Greenfield

June 13, 2013

Bandwidth is one of the key factors that can impact network performance. Learn how WAN optimization uses deduplication to address this issue and how to evaluate different deduplication...

Data Centers

WAN Optimization Part 2: Put Performance Second

David Greenfield

May 24, 2013

If you’re looking to purchase WAN optimization gear, don’t get wrapped up in performance numbers. Start instead with pricing, deployment and operational issues, and the protocols and...

Networking

WAN Optimization Part 1: TCP Limitations

David Greenfield

March 28, 2013

WAN optimization and application acceleration technologies help get around performance limitations in TCP. Here’s how the numbers add up.

Cloud Infrastructure

7 Modeling Tools To Help Assess Cloud ROI

David Greenfield

January 09, 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...

Data Centers

Disaster Recovery Lessons You Might Have Missed

David Greenfield

November 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—...

Networking

What WAN Optimization Can Teach SDN About Tunneling

David Greenfield

November 06, 2012

Network tunnels used to have a bad reputation, but the rise of software-defined networking (SDN) and network virtualization is changing that. WAN optimization, which uses tunnels, may offer...

Data Centers

BufferBloat And The Collapse Of The Internet

David Greenfield

April 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...

Data Centers

Welcome To The WAN Optimization Shell Game

David Greenfield

April 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...

Data Centers

The Importance Of Correcting Packet Loss In VDI

David Greenfield

March 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,...

Data Centers

What WAN Optimizers Can Learn From Firewalls

David Greenfield

March 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...

Data Centers

The First IPv6 WAN Optimizer: Speed At What Price?

David Greenfield

February 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...

Data Centers

WAN Optimization and the VDI Challenge

David Greenfield

February 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...

Data Centers

Data Centers: The Next Frontier For WAN Optimizers?

David Greenfield

January 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...

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David Greenfield

Articles