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RamDisk

Thin-Client Server Solutions.

Use a Ramdisk and Optimize performance

Citrix® MetaFrame® Presentation Server &
Microsoft® Terminal Server


Server-based computing, by definition, places the entire responsibility for data retrieval, processing, and storage on the server. While this method of leveraging hardware and software resources can be very cost-effective, it also places demands on resources that can degrade client performance. The performance of storage- and memory-intensive user applications is especially sensitive to this model of computing.

Heavy loads can result in unacceptable
client performance


Under moderate to heavy server loads, users of Citrix MetaFrame Presentation Server and Microsoft Terminal Server may experience poor response times, extended log-in periods, protracted screen-refreshes, and very slow print queues. During very heavy load periods, application startup times can increase to minutes instead of seconds, SQL queries and other compute- and data-intensive operations can lengthen to the point where processes must be killed for lack of responsiveness.

Context switching and disk thrashing

As increased demands are placed on system resources particularly storage resources context switching rates can quickly rise above healthy levels. At very high rates, the system is actually realizing less work. This is because threads and processes are increasingly unable to access the resources they require, so the operating system must switch many times from one waiting thread or process to another until it finds one with available resources. This condition is frequently accompanied with high levels of disk thrashing.

Use processor and memory resources to
enhance performance


When disk I/O begins to constrain overall system performance, other system resources become underutilized. By putting these resources to work, system performance is improved. Disk caches and RAM disks help optimize system resource utilization by applying processor and memory resources to the I/O bottleneck.

Block-level caches, inserted into the I/O path of persistent data, cache the most active or all data blocks. With deferred-writing enabled, a cache can dramatically improve context switching, enhancing server responsiveness, resulting in a much more satisfying and productive user experience.

When access to temporary data such as print spool files is bottlenecked, RAM disks are an effective solution.


Click to view how to optimize Server Performance with Ramdisk.

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