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Citrix Systems

Citrix Systems is a software company known for creating virtualization and secure remote access software. Questions about this company and its products belong here.

174 Questions

Science

Citrix Systems

Briefly define FCFS scheduling?

Asked by Wiki User

First-Come, First-Serve (FCFS) scheduling is one of the simplest scheduling algorithms in the realm of operating systems, and its implementation offers a straightforward approach to process management. In FCFS scheduling, processes are executed in the order they arrive in the ready queue, essentially adhering to a first-in, first-out (FIFO) strategy. The fundamental principle behind FCFS is straightforward: the first process to request the CPU gets executed first, and subsequent processes have to wait until the CPU is available again.

The mechanism of FCFS scheduling is simple to understand and implement. When a process enters the system, it gets placed in the ready queue. The CPU scheduler picks the process at the head of the queue for execution and allocates the CPU to this process. The process continues to execute until it either finishes or gets blocked for I/O or some other reason, at which point the CPU is allocated to the next process in the ready queue. This cycle continues until all processes are executed.

FCFS is non-preemptive, meaning once the CPU is allocated to a process, it retains control of the CPU until it completes its execution or gets blocked for some reason. This characteristic simplifies the scheduler design, making FCFS an attractive choice for simple systems or batch processing environments where jobs are more or less independent of each other.

However, FCFS scheduling has its set of drawbacks. It can lead to the "convoy effect," where short processes have to wait for a long process to complete, leading to suboptimal CPU utilization. The average waiting time under FCFS scheduling can be high if long processes arrive at the queue early. Moreover, FCFS does not prioritize processes based on their importance or urgency, which can be a significant limitation in scenarios where certain processes require immediate attention.

Despite its limitations, the simplicity and ease of implementation of FCFS scheduling make it a viable choice in specific scenarios, especially in systems with minimal process management requirements or in batch processing environments. It serves as a foundation for understanding more complex scheduling algorithms and provides a clear illustration of how process scheduling works at a basic level.

In a nutshell, FCFS scheduling is a fundamental, easy-to-implement scheduling algorithm that executes processes based on their arrival order, adhering to a non-preemptive, first-in, first-out strategy. While it may not be the most efficient or versatile scheduling algorithm, its simplicity makes it a useful stepping stone in the study of operating system scheduling algorithms, paving the way for understanding more advanced scheduling strategies.

Citrix Systems

What is client lockdown in citrix?

Asked by Wiki User

When you say lock down are you talking about running a program as a published App?

or setting up the user to use Pass Though Authentication so they don't have to re input the user names, passwords and domains

Computer Network Security

Citrix Systems

Cisco

What is a SOA record?

Asked by Wiki User

A start of authority (SOA) record is information stored in a domain name system (DNS) zone about that zone and about other DNS records. A DNS zone is the part of a domain for which an individual DNS server is responsible. Each zone contains a single SOA record. SOA records are defined in IETF RFC 1035, What_is_SOA_records- Implementation and Specification.

What is citrix data collector?

Asked by Wiki User

Data Collectors and Elections

A data collector is an in-memory database that maintains dynamic information about the servers in the zone, such as server loads, session status, published applications, users connected, and license usage.

Data collectors receive incremental data updates and queries from servers within their zone. Data collectors relay information to all other data collectors in the farm. The data collector tracks, for example, which applications are available and how many sessions are running on each server in the zone. The data collector communicates this information to the data store on behalf of the other servers in the farm. By default, in farms that communicate indirectly with the data store, the first server in the farm functions as the data collector.

Farms determine the data collector according to what level the election preference is set for a server. By default, all servers joining the farm are configured as backup data collectors. When the zone's data collector fails, a data collector election occurs and a backup data collector replaces the failed data collector.

If the data collector fails, existing and incoming sessions connected to other servers in the farm are not affected. The data collector election process begins automatically and a new data collector is elected almost instantaneously. Data collector elections are not dependent on the data store.

New Data Collector ElectionWhen communications fail between data collectors or between a server and its data collector, the process to choose or elect a new data collector begins. For example:

The data collector for Zone 1 has an unplanned failure. If the data collector shuts down correctly, it triggers the election process as it shuts down.
The servers in Zone 1 detect the data collector failed and start the election process. The server set to the next highest election preference is elected as the new data collector.
The member servers start sending their information to the new data collector for Zone 1.
The new Zone 1 data collector replicates this information to the other data collectors in the farm.

Sometimes, you might decide to have a dedicated data collector after your farm is in production. In general, if users experience slow connection times due to high CPU utilization on the data collector, consider dedicating a server to act solely as the zone data collector.

Citrix Systems

Why is ICA that much faster than RDP mention technological differences?

Asked by Shivangg

because of compression methods used by citrix to allow users delivering applications much secure and much faster.

Computers

Local Area Network

Computer Network Security

Citrix Systems

Functions of wan?

Asked by D1

Wide area network generally consist of two or more local networks . Computers connected to a WAN are often connected through public Computers connected to a wide-area network are often connected through public networks, such as the telephone system. Wanos network less the costs and accelerate more network speeds. Like this you can get more provider those are providing WAN services.

Bluetooth

Citrix Systems

Cisco

The Difference Between

What is the difference between encoding and encrypting?

Asked by Wiki User

opening/playing/reading/watching a file (Decoding) and making a file (Encoding)

there are many different ways to read/write a bunch of "1's" and "0's." A files extention (.wav; .mp3; .iso; etc) explains how that file should be read as/written as. For example, this paragraph could be written in Spanish and generally say the same thing with the same general letters.

Local Area Network

Bluetooth

Citrix Systems

Topology

What does Topology mean?

Asked by Wiki User

star topology,bus topology,ring topology,mesh topology etc...

Local Area Network

Windows XP

Citrix Systems

Example of client server?

Asked by Wiki User

The example of client server model is that to check your bank account from your computer, a client program in your computer forwards your request ro a server program at the bank. this program may in turn forward the request to its own client program that sends a request to a database server at another bank computer to retrieve your account balance.The balance is returned back to the bank data client, which in turn serves it back to the client in your personal computer,which displays the information for you.

Citrix Systems

In what year was Citrix founded?

Asked by Wiki User

Citrix Systems is a multinational company that was founded in 1989. It was created when one of the original IBM founders left the organization and went off on his own to create a software focused company.

Citrix Systems

What is a WANscaler?

Asked by Wiki User

WANScaler is the old name for Citrix Repeater which provides high-performance delivery to branch office users. It provides application acceleration to all offices of all sizes, datacenters and mobile workers.

Citrix Systems

Electronics

Is amplitude in ask is more resistive to emi and noise?

Asked by Wiki User

yes

Citrix Systems

How do you change the xml service port?

Asked by Shivangg

Knowledge Center Home > CTX104063

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Article Feedback Print View Languages: * Select ** 日本語 = Explaining and Changing the Citrix XML Service Port = Document ID: CTX104063 / Created On: May 7, 2004 / Updated On: Apr 16, 2008

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Explaining the XML Service The Citrix XML Service was introduced with MetaFrame 1.8 Service Pack 2 and a Feature Release 1 license needed to be installed. MetaFrame XP and later incorporates the Citrix XML Service as a standard feature. When MetaFrame 1.8 Service Pack 2 or later is installed and the server rebooted, the Citrix XML Service binaries are placed on the system whether the Citrix XML Service was or was not installed. All that must be done to complete the Citrix XML Service installation is to register the XML Service itself by running the ctxxmlsscommand. Unlike MetaFrame XP or later, MetaFrame 1.8 does not allow for the sharing of port 80 with IIS. The below command-line syntax applies to all MetaFrame environments: CTXXMLSS.EXE Command Line Usage Syntax CTXXMLSS [switches] [/Rnnnn] [/Knnn] [/U] [/?] Parameters /Rnnnn - Registers the service on port number nnnn /Knnn - Keep-Alive nnn seconds (default 9). /U - Unregisters the service. /? (help) - Displays the syntax for the utility and information about the utilities options. After the Citrix XML Service is registered, a new service appears in the Services Applet and registry entries are created. Ensure this service is started. To determine which port is being used, either look in the Citrix Management Console (MetaFrame XP and later) and/or locate the following registry key (assuming IIS port sharing is not being used): WARNING: Using Registry Editor incorrectly can cause serious problems that may

require you to reinstall your operating system. Microsoft cannot guarantee that problems

resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at

your own risk.For information about how to edit the registry, view the "Changing Keys

and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete

Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Make

sure you back up the registry before you edit it. If you are running Windows NT, also

update your Emergency Repair Disk (ERD). HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CtxHttpValue: "TcpPort" If the value is listed in hex, change to a decimal notation. If Microsoft IIS is installed, the administrator of the MetaFrame XP installation is given the option to install the Citrix XML Service and share a port with IIS. In fact, no separate XML Service is running. IIS serves the XML data using an ISAPI filter named Wpnbr.dll located in the \Inetpub\Scripts folder. To remove the Citrix XML Service functionality from your MetaFrame server, simply rename or delete the Wpnbr.dll file. Lastly, once the XML Service port is changed on the MetaFrame Servers, change NFuse or Web InterFace, MetaFrame Secure Access Manager, or the Program Neighborhood Client to use the new port. Unregistering the XML Service 1. Open a command Prompt window. 2. Run ctxxmlss /u (This command will unregister the Citrix XML Service and mark it for deletion). 3. Reboot the server.

Registering the XML Service on a port other than sharing with IIS 1. Unregister the service using the previous instructions. 2. Open a command Prompt window. 3. Run ctxxmlss /r[Port Number] (Notice that there is no space between the switch "/r" and the port number. 4. Reboot the server or open the service control manager and manually start the Citrix XML Service.

Registering the XML Service to share the port with IIS 5.0 1. Unregister the service using the previous instructions. 2. Copy the files ctxxmlss.txt, clm.dll, wpnbr.dll to the \Inetpub\Scripts folder. ***(If you are running MetaFrame Presentation Server 3.0 then the clm.dllfile is no longer needed).*** 3. If you are running MetaFrame Presentation Server 3.0 or Citrix Presentation Server 4.0, locate the file ctxadmin.dll and copy it to a folder called ctxadmin under \Inetpub\Scripts. 4. If you are running Citrix Presentation Server 4.0, locate the files ctxconfproxy.dll,ctxsta.dll,ctxsta.config and copy them to \Inetpub\Scripts. 5. Open the IIS Manager MMC Snap-in. 6. Expand the Default Web Site. 7. Right-click the Scripts folder and click Properties. 8. On the Virtual Directory tab make sure that the Execute Permissionsfield is set to Scripts and Executables. 9. Open a command prompt window. 10. Run the iisreset command (be aware that this command will restart all IIS-related services).

Registering the XML Service to share the port with IIS 6.0 For Citrix Presentation Server 4.0 on Windows 2003, refer to CTX107683 - How to Configure the XML Service to Share with IIS. Otherwise, follow these steps: By default when installing IIS 6.0 the virtual Scripts Folder is not created. 1. Unregister the service using the previous instructions. 2. Navigate to the \Inetpub folder and create a new folder named Scripts. 3. Open the IIS Manager MMC Snap-in. 4. Right-click the Default Web Site and select New | Virtual Directory… 5. Click Next. 6. Under Alias: type the name Scripts and click Next. 7. Under Path: type Drive Letter:\Inetpub\Scripts and click Next. 8. Under Allow the following permissions:make sure that the following are selected: a. Read b. Run Scripts (such as ASP) c. Execute (such as ISAPI applications or CGI)

9. Click Next and click Finish. 10. Right-click the Scripts virtual directory and go to Properties. 11. Under the Virtual Directory tab make sure that the Execute Permissions: field is set to Scripts and Executables. 12. Under the Directory Security tab, click Edit… under Authentication and Access Control and make sure that the Enable anonymous access check box is selected. 13. Now copy the files ctxxmlss.txt, clm.dll, wpnbr.dll to the newly create Scripts folder under the Inetpub folder. ***(If you are running MetaFrame Presentation Server 3.0 then the clm.dll file is no longer needed).*** 14. If you are running MetaFrame Presentation Server 3.0 locate the file ctxadmin.dll and copy it to a folder called ctxadmin under \Inetpub\Scripts. 15. In IIS Admin right-click Web Service Extensions, select Add a new web service extension. Type the name Citrix XML ISAPI in the Extension name field and click Add. In the Add File popup window, type in or browse to the location of the wpnbr.dll file. Then finish by selecting the Set the extension status to allowed check box. 16. For MetaFrame Presentation Server 3.0, in IIS Admin right-click Web Service Extensions, select Add a new web service extension. Type the name Citrix XML Administration ISAPI in the Extension name field and click Add. In the Add File popup window, type in or browse to the location of the ctxadmin.dll file. Then finish by selecting the Set the extension status to allowed check box. 17. Run the iisreset command (be aware that this command will restart all IIS-related services). Note: The file ctxxmlss.txt is located in the Program Files\Citrix\System32 folder and the files clm.dll and wpnbr.dll are located in the %SYSTEMROOT%\System32 folder. With MetaFrame Presentation Server 3.0, all the files required are located in Program Files\Citrix\System32.