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Sebastian Kruk

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Top Stories by Sebastian Kruk

A question that every online application provider will face eventually is: Does my application scale? Can I add an extra 100 users and still ensure the same user experience? If the application architecture is properly designed the easiest way is to put an additional server behind the load balancer to handle more traffic. In this article we recount an incident that happened to one of our clients when the cause of poor application performance was eventually attributed to problems with the load balancing of the application servers. HTTP Server (500) Errors Go Over the Roof Around 8 am the Operations team at Rendoosia Inc. (name changed for commercial reasons) got an alert from the APM tool that one of three SharePoint servers was generating many HTTP Server (500) errors. All three servers were behind a load balancer; hence why the team decided to analyze the overall p... (more)

Five Steps to Improve E-Commerce Performance for Increased Sales

The saying "if it doesn't exist on the Internet, it doesn't exist"[1] is ringing truer every day. Nowadays, it is hard to imagine most businesses without an e-commerce platform, let alone without a web presence at all. Since e-commerce is becoming the new standard, e-commerce performance needs to be at its best. In this blog series, I have come up with several ways to ensure your company's e-commerce performance success, including: avoiding unnecessary network load,reducing number of (internal) HTTP errors, improving backend performance,understanding your clients, ensuring scal... (more)

Filling the Citrix Visibility Gap with an Application-Aware Network

Citrix XenApp or XenDesktop is a perfect fit for lowering the costs of desktop management and simplifying access to the hosted applications from any device. Last week we discussed some challenges to application performance monitoring (APM) introduced by Citrix. Apart from getting yet another component in the data center to take care of, the virtualized application delivery becomes "black boxed" from the APM perspective. It gets harder to isolate the fault domain to the network, the infrastructure, or the applications themselves. In the previous post we presented the case of The ... (more)

How Workstation Hardware Problems Can Affect SAP Performance Perception

Introducing SAP is a cost that makes everyone very cautious about the return on this investment. Performance problems with SAP delivery can quickly propagate to seriously affect business operations and lead to tedious war room scenarios. End-user complaints will usually point towards the SAP team, the SAP team will blame the network, and IT operations team will fight back. But what if the root cause of the problem is something altogether different. The inability to quickly determine the root cause of the performance problem often leads to war room scenarios, especially when the mo... (more)

Application Performance Problems? When to Blame the Untrained End User

In my previous posts I wrote about how important it is to have end-to-end visibility into SAP in order to avoid serious problems in our delivery chain or to discover that application performance degradation was caused by malfunctioning hardware. One of our New Zealand customers, Fonterra, who is the world's largest exporter of dairy products, uses SAP to support its delivery chain of dairy products made from 22 billion liters of milk collected each year. In this article we show how Fonterra uses a new generation of APM tools that provide both user and transactional insight, as we... (more)