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Server Mirroring Dedicated Servers

by Leif Cage
If you have a dedicated server on which you have a mission critical website running then it is surely not good for you to face any downtime. For this reason some techniques for backups are used. One of the techniques for backup is the Mirroring of the server. In this technique, two servers with the same configuration are setup. Out of these two servers, one server is the Master server and the other is the Slave server. This is done for the purpose of backing up the Master server. If due to any reason, the master server fails or faces any kind of problem then the slave server immediately takes its place. As a result of this arrangement, there is no downtime faced by any of the websites. This kind of arragement i.e. the mirroring solution is generally done with the help of FAM and RSYNC modules. This process is know as the Failover dedicated servers process.

Failover process is the process in which the Master server is replaced by the Slave server in case the Master server faces downtime i.e. fails due to some problems. The user and the applications which are requested to the master server are automatically directed to slave server. One more process is involved which is known as the Restroration process.

If the master server fails and the slave server is replaced instead of it, then the slave server will have the data modified after the master server has failed. Restroration process is the process in which the data which has been modified is sent back to the master server which is said to be its original place. Since the data on the master server is already maintained in the slave server the data does not require each and every file to be selected and transferred.

The data on the slave server will be of great benefit if the master server has crashed due to a disk crash which results in the complete data loss on the master server. But as the data is present on the Slave server, it is very easy to get the data back to the master server. The slave server is always up to date due to the RSYNC software and when the master server is ready and can be relied upon, the two server will not have the same information as the slave server has the updated data right from the time master server was failed due to some reason. Restroration is the process of copying the updated data to the master server once the master server is set to come online.

This kind of adjustment is very beneficial for you and it has a lot of advantages. But as there are advantages involved, there are disadvantages involved also. Actually this cannot be called as the disadvantage as the only thing is the cost which is invoved in this process i.e. the mirroring of the servers. As mirroring requires two dedicated servers of the same configuration, you will have to spend double the cost of the dedicated server you select for your websites. If you can afford this cost of having two dedicated servers of the same configuration then you should go for Mirrored servers as they will always help you to keep your websites online. Some of the web hosting providers do not charge for this kind of service apart from the server charges, so you should look for these web hosting providers.

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About the Author

Leif Cage writes about Dedicated Servers, Windows Dedicated Servers and SEO.

Wednesday, Oct 14th, 2009