Microsoft Terminal Server Performance Solution

    Microsoft’s Terminal Server features security, centralized management, lower costs, and greater reliability. However, as the number of users and applications grows, performance bottlenecks begin to appear. User-response times increase and application performance can slow to unacceptable levels. These behaviors are commonly caused by bottlenecks in the storage subsystem.
Problem: Restricted user load capacity
  Terminal Server relies heavily on the user profile and system page files. When the number of users rises above about 20, the ability of the Windows file system cache to efficiently handle transfers to and from the user profile and application files diminishes. At the same time, system page file activity tends to increase dramatically, throttling overall system performance.
Solution: Cache the user profile and system page files
 

To increase the user load capacity, move the user profile and system page files to a separate storage volume (partition) and cache that volume with SuperCache II. A volume of 10 to 20 GB is typically more than sufficient to contain these files. The recommended cache size is about one third to one half the amount of main memory. On systems with uninterruptible power supplies (UPS), performance will be enhanced further by enabling write-caching.

For example, on a server with 4 GB of RAM and a UPS, set SuperCache II to a 1600 MB cache size, a 1 page read-ahead, and a 15 second lazywrite latency.

Responsiveness can be improved even further by moving application data to the volume cached with SuperCache II. Placing frequently used application data on the cached volume improves its access times, reduces disk contention, and accelerates Terminal Server performance.

Double User Load Capacity
  User load capacities are typically doubled with this solution. With SuperCache II installed and configured as described above, a server can provide the same level of performance to 30 to 40 users that it does to 15 to 20 users without it.
   

See Also:

Citrix Performance Solutions

Thin-Client Server Solutions
Messaging and Collaboration Server Solutions
Database Server Solutions
Business Intelligence Server Solutions
Web Server Solutions
Server Cluster Solutions


Citrix   HP   IBM

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