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Citrix Systems 4.2 manual Over-Provisioning and Service Offering Limits

Models: 4.2

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Chapter 12. Working With Hosts

mysql> select id from cloud.host where name like '%h%';

4.This should return a single ID. Record the set of such IDs for these hosts.

5.Update the passwords for the host in the database. In this example, we change the passwords for hosts with IDs 5, 10, and 12 to "password".

mysql> update cloud.host set password='password' where id=5 or id=10 or id=12;

12.9. Over-Provisioning and Service Offering Limits

(Supported for XenServer, KVM, and VMware)

CPU and memory (RAM) over-provisioning factors can be set for each cluster to change the number of VMs that can run on each host in the cluster. This helps optimize the use of resources. By increasing the over-provisioning ratio, more resource capacity will be used. If the ratio is set to 1, no over-provisioning is done.

The administrator can also set global default over-provisioning ratios in the cpu.overprovisioning.factor and mem.overprovisioning.factor global configuration variables. The default value of these variables is 1: over-provisioning is turned off by default.

Over-provisioning ratios are dynamically substituted in CloudPlatform's capacity calculations. For example:

Capacity = 2 GB

Over-provisioning factor = 2

Capacity after over-provisioning = 4 GB

With this configuration, suppose you deploy 3 VMs of 1 GB each:

Used = 3 GB

Free = 1 GB

The administrator can specify a memory over-provisioning ratio, and can specify both CPU and memory over-provisioning ratios on a per-cluster basis.

In any given cloud, the optimum number of VMs for each host is affected by such things as the hypervisor, storage, and hardware configuration. These may be different for each cluster in the same cloud. A single global over-provisioning setting can not provide the best utilization for all the different clusters in the cloud. It has to be set for the lowest common denominator. The per-cluster setting provides a finer granularity for better utilization of resources, no matter where the CloudPlatform placement algorithm decides to place a VM.

The overprovisioning settings can be used along with dedicated resources (assigning a specific cluster to an account) to effectively offer different levels of service to different accounts. For example, an account paying for a more expensive level of service could be assigned to a dedicated cluster with an over-provisioning ratio of 1, and a lower-paying account to a cluster with a ratio of 2.

When a new host is added to a cluster, CloudPlatform will assume the host has the capability to perform the CPU and RAM over-provisioning which is configured for that cluster. It is up to the administrator to be sure the host is actually suitable for the level of over-provisioning which has been set.

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Citrix Systems 4.2 manual Over-Provisioning and Service Offering Limits
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4.2 specifications

Citrix Systems, a leading provider of virtualization solutions and cloud computing technologies, released version 4.2 of its popular software, Citrix XenApp, which was previously known as Presentation Server. This version marked a significant evolution in providing users with remote access to applications and desktops, emphasizing simplicity, performance, and security.

One of the standout features of Citrix XenApp 4.2 is its improved application streaming capabilities. This technology allows applications to be delivered to users in real-time, reducing the need for extensive local installations and enhancing the user experience. With application streaming, administrators can efficiently manage applications on a central server while ensuring that users have immediate access to the necessary tools.

Another highlight of this version is the enhanced security measures put in place to protect sensitive data. Citrix XenApp 4.2 includes support for SSL encryption, providing a secure communication channel for data transmitted between the server and clients. This is particularly crucial for businesses that need to comply with strict data protection regulations. Additionally, the integration of endpoint security features ensures that unauthorized access to applications is minimized.

Performance enhancements are also a critical focus in this release. Citrix optimized the delivery of applications over various network conditions, ensuring that users experience minimal latency regardless of their location. This was achieved through the incorporation of SmartAccess and SmartControl technologies, which allow administrators to set policies based on user roles, device types, and network conditions. This level of granularity enables organization-wide security without compromising on usability.

The user experience was further improved with a revamped interface, making it easier for end-users to access their applications and data. Simplified menus, clear navigation paths, and the ability to customize user settings contributed to a more efficient workflow, allowing users to focus on their tasks rather than struggling with the software.

Finally, Citrix XenApp 4.2 was designed to be highly scalable. Organizations of all sizes could deploy this solution to deliver applications efficiently, adapting to their specific needs as their user base grows or changes. This flexibility is crucial for businesses looking to future-proof their IT investments while maintaining optimal performance.

In summary, Citrix XenApp 4.2 stands out with its enhanced application streaming, robust security features, improved performance under varying conditions, user-friendly interface, and scalability, making it an ideal choice for organizations seeking to leverage virtualization for remote access to applications and desktops.