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| A typical Citrix XenApp server infrastructure |
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Citrix® environments have grown in popularity as cost-effective, efficient modes of accessing a variety of heterogeneous applications on-demand. In order to be an effective alternative for desktop applications, Citrix environments must deliver the same quality of service that users have come to expect from local applications.
Typically, Citrix server farms include multiple tiers of software. A front-end web interface (Nfuse) server is used to support web-based accesses to the server farm. Active directory servers handle user authentication and rights association, while user profiles are loaded from profile servers. The authenticated requests are passed to the Citrix XenApp (Presentation) servers that host a number of applications. In turn, the applications may use backend databases, printers, etc., for different functionalities.
While Citrix-based access infrastructures offer economies of scale, there are significant challenges in monitoring Citrix server farms.
Citrix Server Monitoring
A server failure can be catastrophic : In a typical Citrix infrastructure, all the processing is done on the servers. Hundreds of users may be accessing the Citrix farm. Hence, even a transient problem in the farm can impact all the users accessing the farm. Furthermore, since different applications are hosted on the same server, a performance problem (e.g., a memory leak) of one application can adversely impact the performance of all the other applications hosted on the server. Likewise, since multiple users access applications on the same server, a rogue user can impact the performance of all the other users accessing the Citrix server.
Citrix Network Monitoring
Citrix infrastructures are distributed, heterogeneous, and multi-vendor : Users access a Citrix farm from different geographic locations, over WAN links. The users may be logging in from different networks, using different client terminals. For the Citrix service to function well, all the applications and devices involved in service delivery must perform well.
Therefore, monitoring
network devices and links, Active Directory servers, Citrix XenApp servers, backend applications. database servers, etc.
becomes all the more critical.
End to end Citrix Monitoring
Citrix service delivery involves multiple inter-dependent applications : Owing to the multi-tier nature of Citrix environments, a slow-down in one tier (e.g., the authentication server) can cause a slow-down of the entire service. When a slow-down occurs, an administrator of the Citrix farm has to quickly determine what the source of the problem could be - i.e., Is it the network? Or the web interface server? Or the Active Directory server? Or the profile server? Or the Citrix XenApp server? Or the backend database? Accurate, fast diagnosis of problems helps reduce downtime and improve customer satisfaction.
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| Limitations of a silo-based approach to monitoring: A slowdown in one tier (e.g., the database) can impact all the other tiers (e.g., the web server, Citrix XenApp server). |
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