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Back to Basics: The Theory of (Performance) Relativity

#webperf #ado Choice of load balancing algorithms is critical to ensuring consistent and acceptable performance   One of the primary reasons folks use a Load balancer is scalability with a secondary driver of maintaining performance. We... Read more
0 Reviews

Architecting Scalable Infrastructures: CPS versus DPS

#webperf As we continue to find new ways to make connections more efficient, capacity planning must look to other metrics to ensure scalability without compromising performance. Infrastructure metrics have always been focused on speeds and... Read more
0 Reviews

WILS: Moore’s Law + Application (Un)Scalability = Virtualization

#Virtualization was inevitable. One of the interesting side effects of having been a developer before migrating to a more network-focused view of the world* is it’s easier to understand the limitations and constraints posed on networking-based... Read more
0 Reviews

F5 Friday: Performance, Throughput and DPS

No, not World of Warcraft “Damage per Second” - infrastructure “Decisions per second”. Metrics are tricky. Period. Comparing metrics is even trickier. The purpose of performance metrics is, of course, to measure performance. But like most tests,... Read more
0 Reviews

Load Balancing Fu: Beware the Algorithm and Sticky Sessions

The choice of load balancing algorithms can directly impact – for good or ill – the performance, behavior and capacity of applications. Beware making incompatible choices in architecture and algorithms.   One of the most persistent... Read more
0 Reviews

F5 Friday: The Data Center is Always Greener on the Other Side of the ADC

Organizations interested in greening their data centers (both green as in cash as well as in grass) will benefit from the ability to reduce, reuse and recycle in just 4Us of rack space with a leaner, greener F5 VIPRION According to the latest... Read more
0 Reviews

WILS: Load Balancing and Ephemeral Port Exhaustion

Understanding the relationship between SNAT and connection limitations in full proxy intermediaries. If you’ve previously delved into the world of SNAT (which is becoming increasingly important in large-scale implementations, such as those in... Read more
2 Reviews

Lots of Little Virtual Web Applications Scale Out Better than Scaling Up

Surprised? I was, but I shouldn’t have been. While working on other topics I ran across an interesting slide in a presentation given by Microsoft at TechEd Europe 2009 on virtualization and Exchange. Specifically the presenter called out the... Read more
0 Reviews

WILS: Layer 7 (Protocol) versus Layer 7 (Application)

The problem with HTTP (okay, one of the problems with HTTP, happy now?) is that it resides at the top of the “stack” regardless of whether we identify the “stack” as based  upon the TCP/IP stack or the OSI model stack. In either case, HTTP... Read more
0 Reviews

How to Gracefully Degrade Web 2.0 Applications To Maintain Availability

I haven’t heard the term “graceful degradation” in a long time, but as we continue to push the limits of data centers and our budgets to provide capacity it’s a concept we need to revisit. You might have heard that Twitter was down (again) last... Read more
0 Reviews

WILS: How can a load balancer keep a single server site available?

Most people don’t start thinking they need a “load balancer” until they need a second server. But even if you’ve only got one server a “load balancer” can help with availability, with performance, and make the transition later on to a multiple... Read more
0 Reviews

Dynamic Infrastructure Makes Static Connection Limitations Obsolete

One of the benefits of Infrastructure 2.0 is connectedness: the ability to collect and share pertinent data regarding the health and performance of applications and infrastructure services. Based on that data a dynamic infrastructure can adapt... Read more
0 Reviews

Load Balancing on the Inside

Business critical internal processing systems often require high-availability and fault tolerance, too. Load balancing and application delivery is almost always associated with scaling out interactive, web-based applications. Rarely does anyone... Read more
0 Reviews

The Myth of 100% IT Efficiency

Idle resources will always need to exist, especially in a cloud architecture With IT focused on efficiency – for reduction in operating expenses and in the interests of creating a greener computing center – there’s a danger that we’ll attempt to... Read more
0 Reviews

To Boldly Go Where No Production Application Has Gone Before

The importance of stress-testing in production Everyone is still a-twitter over the problems the web experienced last week right after the news of Michael Jackson’s death. There have been Jackson dies, almost takes Internet with... Read more
0 Reviews

Virtual Network Infrastructure: Virtually Good Enough?

Two steps forward, three steps back Every time there is a major shift in technology thought about architecture the question of how it will and should impact infrastructure arises. When SOA was the “next great thing” there was a spate of... Read more
0 Reviews

Not All Virtual Servers are Created Equal

How to optimize compute resources in a heterogeneous environment using weight/ratio-based load balancing Unless you’re starting from scratch your data center is full of physical servers of various and sundry sizes, colors, shapes, and compute... Read more
0 Reviews

WAN Optimization is not Application Acceleration

Increasingly WAN optimization solutions are adopting the application acceleration moniker, implying a focus that just does not exist. WAN optimization solutions are designed to improve the performance of the network, not applications, and while... Read more
0 Reviews

The New, New Math of Cloud

It’s been a long time since I had the (mis)fortune to sit in a math class, so bear with me while I figure this out. In order to determine my daily budget for the application I am hosting with Google’s App  Engine, I need to sum the results of... Read more
0 Reviews

How Obama's Blueprint For Change Impacts IT

While doing some research on a related topic I dug into the technical aspects of Obama's Blueprint For Change. The plans around technology are fairly nebulous, with a few exceptions, such as those related specifically to broadband... Read more
0 Reviews

How Sears Could Have Used the Cloud to Stay Available Black Friday

The prediction of the death of online shopping this holiday season were, apparently, greatly exaggerated. As it's been reported, Sears, along with several other well known retailers, were victims of heavy traffic on Black Friday. One wonders... Read more
0 Reviews

3 Really good reasons you should use TCP multiplexing

AJAX. SOA. Social network API integration. What is TCP Multiplexing? All of aforementioned technologies have one thing in common. Okay, they have more than that in common,  but for the purposes of this discussion... Read more
1 Review

Virtual Server Sprawl: FUD or FACT?

At Interop this week, security experts have begun sounding the drum regarding the security risks of virtualization and reminding us that virtual server sprawl magnifies that risk because, well, there are more virtual servers to manage at risk. ... Read more
0 Reviews

6 Reasons You Need an Application Delivery Controller Now

Application delivery controllers, and load balancing in general, are often seen as solutions waiting for a problem to solve. We know what those problems are, but until we experience them we often don't feel a sense of urgency in acquiring and... Read more
0 Reviews