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| Citrix server-based architecture is characterized by its 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. Print server jobs may take excessively long or be serviced erratically.
These behaviors are commonly caused by bottlenecks in the storage subsystem. |
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| User Load Performance | ||
Problem: restricted user load capacity |
Citrix MetaFrame servers running on Windows 2000 and Windows Server 2003 platforms rely heavily on the user profile and system paging 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 paging file activity tends to increase dramatically, throttling overall system performance. | |
Solution: cache the user profile and system
paging files |
To increase Citrix’ user load capacity, move the user profile and system paging 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. Citrix’ 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 Citrix performance. |
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Double Citrix’ 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 Citrix users that it does to 15 to 20 users without it. | |
| Print Server Performance | ||
Problem: poor print server performance |
Print servers running under Citrix also tend to suffer from poor performance, even under relatively light loads. Bottlenecks in the print spooler’s data paths are frequently the cause. | |
Solution: place the spool file in a RAM disk |
To alleviate this problem, move the print spool file to a RAM disk of an appropriate size. Placing the spool file in RAM eliminates all contention with disk resources, resulting in highly efficient printing and near-zero impact of print jobs on the rest of the system. See Also: Microsoft Terminal Server Solution |
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U.S. Patents Nos. 5577226, 5606681, 5918244, 6370615, 6629201, 6651136, 7017013, 7039767, 7111129 and other worldwide patents pending.
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