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Sebastian Kruk

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Top Stories by Sebastian Kruk

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 National Bank of San Borodin (NBSB -name changed for commercial reasons). The bank decided to expand its reach beyond the small island of San Borodin and render the access to its banking applications by its agents through Citrix XenApp. Ensuring good quality of service imposed additional cha... (more)

Let's Not Play Blame Games

When the operations team gets an alert about potential performance problems that users might be experiencing, it is usually either the infrastructure or the actual application that is causing those problems. Things get interesting when neither the ISP nor the application provider is willing to admit fault. Can we tell who is to blame? Could it be that it is neither the ISP nor the application provider? The IT department of our customer, SerciaFood, a food production company from Sercia (names changed for commercial reasons), received complaints about the performance of one of it... (more)

Balancing the Load

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... (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)

Using a Performance Management Database to Identify Network Problems

Two weeks ago I wrote about how the world's largest exporter of dairy products uses SAP to support their huge delivery chain of dairy products. We recounted how Fonterra used an Application Performance Monitoring (APM) tool to discover that additional training for employees was necessary to speed up certain critical SAP transactions: some employees weren't optimizing attributes passed to the reports based on custom T-Codes. Unfortunately, additional SAP training cannot solve all the problems. Separately and unrelated to the training issues, Fonterra started to notice that end-t... (more)