Cluster computing is the group of connected computers that work together in various aspects and form single computer shape. The components of cluster computing are connected through fast local area network. It is usually done to enhance the performance and is available in form of single computer.There are two types of clusters which are as follows:

High availability clusters:

It is also called failover clusters that are implemented for the availability of the services. They work with the use of redundant nodes that provide assistance when the components of system fail. The Common size of HA cluster is consisting of two nodes that provide quite good amount of redundancy. The implementation of HA cluster is done for the redundancy of the components and removes the risk of single point failure.

Load-balancing clusters

It is implemented when many computers are connected to share functional or computational work load in form of single virtual computer. Requests and queries of the users are managed and distributed among all standalone computers to adopt a shape of cluster. It maintains balance among computational works and improves the performance of system due to the implementation of load balancing cluster technique.

Compute clusters

Clusters are formed and used for computational tasks. For example a cluster can support vehicle crashes and computational simulation of weather. The basic task of compute cluster is to couple the two individual nodes to each other. The design of cluster is known as Beowulf cluster. For example a single job related to computer needs frequent connection among nodes and cluster forms a dedicated network to establish this communication.

Grid computing

Grid is also called clusters that focus more on throughput just like computing utility. Grids can incorporate heterogeneous collection of computers as it is used for the optimization of the workload and server to control the location of different jobs assigned to computers.

Advantages of cluster computing

There are many benefits of cluster computing over main frame computers so organization prefers to implement that technique.

Reduction in cost:

The processing power of high performance cluster proves more affordable than a mainframe computer. It reduces price per power unit to get ROI from IT budget.

Improve network technology:

The development of cluster computing has brought vast improvement in networking as it reduces the cost of network implementation and enhances the performance with single main frame computer. As computers are linked through virtual local area network and that network considers each node as separate entity.

Scalability: Cluster computing provides you an extensive feature of scalability. It is easy to expand the computer cluster where there is need of additional node to the network.

Availability:

If the mainframe computer fails, then entire system shuts down. While in cluster computing, if one node fails, the operation of failure node is transferred to other node to ensure that there is no any interruption in the service.

Working with network setting in the computer is very complex issue. Sometimes users fail to connect to internet, it mane lead to frustration and they cannot do their work on time. here, in this article, I would like to share some effective network troubleshooting tips with you that will help you to resolve problem on time. by following these tips, you do not need to pay high amount of money to network professionals.

Basic Causes of network failure

You need to check

If the network card is working fine or not

See the problems in software setting and sometimes bad network card drivers lead to link down situation

If the firewall is on, it also prevents to connect to the server of internet service provider

Wrong and incompatible installation of network hardware create problem

Different issues related to network connections

Solution:

You need to remain sensitive while performing the task of network configuration. For this purpose, you need to check all options existed in your operating system. Go to the control panel and click on the network connection option where you find all configuration options. If you are using large network via a company and you are working as a limited user, then you cannot make adjustment in these settings. You need to log in as an administrator for the purpose of network setting so that you can adjust you network in desired mode.

Verify connections / LEDs

First, you need to check whether the network cable is attached to your system properly or not. Before making any change, check the network cable, and the power supply of other network devices like DSL modem or bridge and the LED working on the network. You can check it easily by viewing the status light of LED. If the green light is on, it shows that card is not connected or not receiving signals. If you are working in small local area network, you need to verify the connection of your switch or router that is connected to your computer server..

Adapter resources:

You also need to check the adapter resources that you can do by going to the new network card and verify that whether it is installed correctly on your computer or not.

Adapter functionality:

In the next step, you need to verify if network cable is supplying power or not that you can do by using ping command on the command prompt of your windows. For this purpose, go to the run and type cmd, it will open a black screen where you need to write ipconfig to check the stature of your network connection.

Protocol:

For network communication, TCP/IP is the most recommended protocol. Mostly network rely on this protocol or other less used are NetBEUI and IPX/SPX.

Firewall:

When your computer fails to get response from your internet service providers, you need to keep your firewall on. Sometimes firewall opening causing problems to the users so that you need to put it off from internet running.

Additional time:

Sometimes, it many time to get connected to network as system search for the connection, detect it and then mane connection. After computer rebooting, give it some time to detect the connection. Windows users can detect it by pressing F5 button when they face network connection problems.

Computer network connectivity can create many problems for those who work on computers or laptops connected to a network. Mostly, network connectivity problems arise from the server and create problems and errors in clients. However, at times the problem might lie in the individual client itself. Network connectivity troubleshooting is something that network administrators, system administrators, network technicians and IT consultants must know since this all comes under their responsibility.

A computer network is a set of computers that are connected with each other over a network (that can be many types, wired and wireless). The main computer to which all other computers in the network are connected is known as the server while other computers are known as clients. The server computer is under the control of a network administrator. A network is connected via network devices. Network devices forward the data to the correct destination based on the address that is sent along with the data. These devices are known as routers and switches.

Computer network connectivity can create problems that can stem out of network devices or the network medium. The most common problem that a network can be stuck with is when it is infected by a virus or spyware, attacked by hackers, accessed by unauthorized users or when faced with faulty configurations. In other case, the network devices will need to be sorted out.

A very common problem that networks are faced with is when they lose connection with a wireless router. In this case power cycling the modem and router will fix the problem. Since these network devices run all the time, they need occasional power cycling to keep them running effectively. These devices are electronic devices and run into frequent problems from time to time and thus can be handled with a simple restart.

It is important to know as to how to go about power cycling. In order to do so, you should unplug both your devices first. If your modem uses a battery, then just reset it after you have unplugged the router. You should plug back the devices after waiting for two minutes or until each of the devices have cooled down a bit. Each of the devices takes their own time and you should wait for them to cool down accordingly.

When we consider the network medium, we need to troubleshoot the problems that occur in the network when it is affected by a virus or accessed by unauthorized users. In this case, network administrators should use troubleshooting commands that are built-in the windows based operating systems and UNIX etc.

Amongst these network troubleshooting commands, the most common command is PING. This command checks the connectivity with the server. The other command that you can make use of is the IPCONFIG command. This command shows the IP address of the computer and also shows the DNS, gateway addresses of the network.

If these troubleshooting commands are used in the right way, you can easily resolve the problems of network connectivity.

Computer troubleshooting is one the most important areas that needs to be worked upon by network administrators and network technicians. Whenever, a computer network is infected by a virus, attacked by hackers or if any hacker gets access to your computer network, then your computer may face a lot of problems or connectivity issues. These connectivity issues arise due to faulty network devices or configurations. When your computer is hacked, your windows and most of other programs get corrupted and stop functioning.

There are some important tips that you need to follow so that you can find solutions to the problems of network troubleshooting.

There are some inherent, built-in troubleshooting commands in Windows based operating systems and UNIX etc. If your network faces access by unauthorised users or any sort of connectivity failures, then you should definitely make use of these trouble shooting tips. Here is a brief overview that might be of help.

1. PING: this is the most important troubleshooting command that checks the connectivity with other computers. You can use the PING command and the check the server’s connectivity. If the Ping command is used in the IP address format, then you can use the IP address in the PING format to streamline the error.

2. IPCONFIG: this is another command in the computer which shows the DNS, DHCP, gateway addresses of the network and subnet mask. There are again a certain set of commands that need to be followed so that you can access teh IP address of the computer in the right way.

3. NSLOOKUP: This is a TCP /IP based command. It checks the DNS records, operating system information and domain names so that the errors of the domain name servers can be taken care of.

4. HOSTNAME: This command allows you to show the computer name. This command is used as a DOS prompt.

5. NETSTAT shows TCP/IP connections in the computer

6. TRACEROUTE is again a very useful networking command that allows debugging of the entire system. It also locates the server that slows down the transmission on the internet and determines the route between two different networks as well.

These are just a few commands that shall help you in achieving your purposes. These troubleshooting tips are a must to know for network administrators, system administrators, network technicians and the IT consultants. In this way network problems can be resolved more easily since the troubleshooting ways arise from within the windows software itself.

All the more it is extremely important to resolve the networking problem as soon as it can be done. In this way, the network administrators can also keep a constant check over the problems and the fact that the computer networks are not infiltrated with. With regular cleanup sessions of windows and applying checks on the server’s functioning and software will keep your network functioning proper.

The following are a few tips related to troubleshooting Windows XP which are both simple and easy to implement.

If you cannot access Add / Remove Window Components in Control Panel

Then a possible Solution to this problem is listed as follows:

1. Insert the Windows XP CD in your CD/DVD ROM.

2. Go to Start menu and select Run. If your Windows is installed in the C drive then type: Expand C:\i386\NETOC.IN_ -rC:\Windows\Inf and press Enter.

If you have installed Windows XP in some other drive then replace “C:\ “ with the drive name accordingly.

Virtual memory Minimum is too Low

A common error message often encountered is: “Virtual memory minimum is too low. Windows is increasing the size of the virtual memory paging file.”

What exactly is a virtual memory? This the space used by computer when it runs short of Random Access Memory (RAM). And Windows handles the setting of this virtual memory in the paging file. If you encounter the above mentioned error/message then we recommend that instead of changing these settings manually, you should let the Windows manage and efficiently manage your virtual memory size.

Moreover, you may also add more RAM to your system. This will not only eliminate the need of virtual memory but will also most definitely enhance the overall performance and response of your computer.

Continual PC rebooting:

Most often Windows XP users complain that their system restarts after shutdown. This is due to the internally added feature provided by Microsoft that allows Windows XP to fix errors automatically. This is possible via the autoboot feature which allows the system to reboot itself in order to fix various errors. Some other factors that might trigger this autoboot feature include corrupt exit sound file; incorrectly configured, corrupt or incompatible hardware; conflicting or incompatible programs or device drives. If your system continually reboots itself then you might be dealing with any of the flowing problems:

• Overheating caused by dust accumulation
• Motherboard gone bad due to leaking capacitors.
• Bad Power Supply
• Incompatible Software or Drivers

Overheating:

In order to protect your pc from the damages caused due to overheating and insulations, it is highly advised that you clean your computer cases every six months in order to arid the internal components of any dust and debris layers. As dust tends to act as an insulator, it may cause serious problems by keeping the components overtly hot.

In addition when your computer boots it is necessary to insure that all of the case fans are operating. If any of the fans are not operating then overheating will result which may in turn lead to bigger problems and issues.

Bad Motherboard:

Once in a while it is advised to check your computer’s motherboard in search of some pungent odors which might be indications of a component burning or even leaking capacitors. If your motherboard’s capacitor tends to malfunction then it can prove to be a harbinger of a multitude of issues and problems. The only solution to this problem is to replace your motherboard.

Incompatible Software or Drivers:

If you have installed any new programs, software or applications or installed or updated a driver recently, then perhaps this might be the very cause of the system booting itself repeatedly. It is recommended that you try to uninstall these newly installed programs and application or try to roll back the currently updated drivers to allow the system to return to its last good configuration.

If you have installed any new programs or software or hardware, then try uninstalling these components and rebooting. Further information on this problem may be easily found on the internet

This simple but effective guide is dedicated to the troubleshooting of windows XP and the common errors and problems associated. Some of the most common error messages that are typically encountered by a majority of Windows XP users have been described below to help you deal with the unpredictable errors and crashes.

Unmountable boot volume Error:

Most often users encounter the error message of Unmountable boot volume while booting their computers. This might be occurring due to unavailability of the boot.ini file. The file may be corrupted or messed up and a possible remedy of this error is listed below:

1. Insert the Windows XP CD in your CD/DVD drive and boot your system.

2. Allow the setup to start and as soon as you see the “Welcome to setup” message, press the letter ‘R’ on your keyboard to enter the Recovery Console.

3. Select the Windows installation to be repaired

4. When you enter the DOS prompt type: chkdsk /p [Enter]

5. Next, enter the following commands: type: fixboot [Enter], Type: Y [Enter], then type: exit [Enter]

6. This will reboot your PC into windows.

NTLDR is not found during boot up error:

For those who have FAT32 partitions in their system, a simple tip is to boot the pc with a Win98 floppy and copy the required NTLDR or NTDETECT.COM files from the i386 directory to the root of the C:\ drive.

For those individuals who have NTFS partitions the procedure is somewhat lengthy. The following are the steps you need to take in order resolve the error:

1. The first step two steps involved are the same as mentioned for the FAT32 partitions case.

2. After pressing the R key on your keyboard, you will be asked to press the number that corresponds to the exact location where you wish to install/repair the windows.

3. Enter in the administrator password if asked.

4. Next, enter in the following commands:

• COPY X:\i386\NTLDR C\:

• COPY X:\i386\NTDETECT.COM C:\

5. Type exit after taking out the CD

NTOSKRNL Missing or Corrupt Error:

If you encounter the error of NTOSKRNL not found then the solution to this problem is quite simple. Follow the first three steps as mentioned in the above case and then jump to the following procedures:

1. Change to the drive that has the CD ROM.

2. CD i386

3. expand ntkrnlmp.ex_ C:\Windows\System32\ntoskrnl.exe

4. If you have installed your in a different location, then simple change to C:\Windows

5. Take out the CD ROM and type exit

HAL.DLL Missing or Corrupt Error:

This error is usually caused by problems in the configuration of the BOOT.INI file on the root of the C: drive.

1. Type bootcfg /list to show the current entries in the BOOT.INI file

2. Type bootcfg /rebuild to repair it

3. Take out the CD ROM and type exit

Network troubleshooting involves the timely recognition and diagnosis of numerous networking issues and problems in order to maximize your network’s performance. The most important step involved in network troubleshooting involves insuring that all the network components and devices are connected properly to each other in particular and to the network in general.

A failure in connecting or properly linking any of the network devices may result in an explosion of connectivity problems that result in ineffective end-to-end communications. The following are a few network troubleshooting tips related to common connectivity problems:

Connectivity Loss – This problem arises when the users are not able to access the network as a whole or they have problems connecting to some part of the network. In order to regenerate the connectivity, it is advisable that you immediately check for any broken links or connectivity breaks in the networks and correct them accordingly. For instance, you might be able to detect some physical problems such as hardware failures and loose cable connections. The following course of actions is recommended:

1. Check Your Ethernet Cable

Insert cables into the connector until you feel a slight click. If there are any loose connections then adjust them and restart your computer.

2. Check PCMCIA Card

If you use a PCMCIA Ethernet card, make sure it is firmly plugged into the PC Card slot on your computer.

3. Check Transceiver

The Ethernet transceiver should also be firmly plugged in the USB or other port on your computer.

Intermittent connectivity – This happens when users have network access for some period of time but the service is not continuous and reliable and the user suffers sufficient moments of downtime. This may prove to be a red flag for the network administrator as it may indicate that the network is on the verge of a major breakdown. Hence thorough investigation is needed. There are also various software utilities available that can troubleshoot a network and which include:

ipconfig – used in order to display the current IP configuration information for a host

ping – This command tests the connections to other IP hosts

tracert – used to displays route taken to destination

netstat – used to displays network connections

Troubleshooting a network Using Ipconfig:

The details of IP address, subnet masks and default gateway can be viewed via this utility. In order to display further information such as the MAC address, IP addresses of the default gateway and the DNS servers Ipconfig /all is used.

Troubleshooting a Network Using Ping:

Ping checks if the destination host is reachable or not.

Troubleshooting a Network Using Tracert:

Tracert is used to provide details concerning connectivity and relevant information about the path taken by the packet in order to reach its destination and also the detail of every hop involved.

Troubleshooting a Network Using Netstat:

Netstat is used to verify connections as it typically lists the protocol in use, the state of the connection, the local address and port number and the foreign address and port number.

In the growing global village, there is enormous use of computers in every part of life and its importance increases if the work is associated with some organizational demand. The increased usage some times causes a lot of start up and working issues. This is usually because of the storage load on the system. To address the issues of problematic working there are numerous computer troubleshooting tips that can help people in easy working with their computers.

When computer speed is effected it effects more than any thing else and one needs to be cautious of all the possible problems that can with held with the computer and that can be resolved in later. The first and foremost computer trouble shooting tip is to defragment the disk. It allows you to have a free space of the disk defragmented. It is built in capacity in a computer and what all you have to do is to approach the area.

It is done by going to start menu and selecting programs, further go into the accessories which later opens into System tools and lastly Disk defragmenter opens. By getting activated with this tip you can have your system speed up. Other than this another procedure can also help you out in speed working of computer which is going to start menu then to run selecting the Msconfig and getting into Startup will ultimately help in deselecting the unnecessary items that can affect the proper working of a system.

These are the start up issues and further there are many other simple as to trouble shoot your computer and this can be done by just cleaning up the disk .This is the same process from start menu to accessories and selecting the clean up utilities which helps sound programs left on your computer. One can increase the ram when there is a lot of data that is required to save on it.

Other than this if you delete the items from the recycle bin you can leave with a lot of space which is taken by unwanted items. If data gets lost in any way, it can also be recovered with different means as by using technical support and applying UPS or generators that can affect the working. Other wise data can be lost where there are load shedding issues. One can find many other tips if he is longing for a proper computer trouble shooting tips. The only thing required is the interest of a person in protecting computer.