Dedicated Server Hosting - High availability
Loadbalancing is not to be equated with high availability. Although the failure of single web servers of the accessibility does not damage, this is not valid for a failure of the Loadbalancers. Who means it with high availability seriously, therefore, does not go past to a failure server which steps in for the main server.
Before you set up a failure server, should be created first to monitoring script which check the offered services on the main server regularly and carry out with not accessibility a simple restart. For safety reasons you should activate, by the way, on the emergency server only when required all services like FTP, message and web server to offer the SSH server.
Moreover, you should think beside the high costs and additional maintenance expenditure for a backup server that the most frequent reasons are to be searched for a server failure in the network technology of the computer centre (failure of a router or Switch). You cannot compensate such for failures also about an emergency server, because this must stand in the same subnet and therefore normally in the same Switch or router hangs.
Who would really like to reach the maximum availability and neither costs nor efforts shies, for that the setup of a backup server is absolutely worth a consideration. A Raid-Level-5-System would be recommended to all others, because an "easy" IDE or SCSI hard disk probably displays the biggest weak dot in the server hardware. The second network card which is bound to the same IPAddress also makes sense. This not only to raise the bandwidth of your server, but also not "to lose" the whole server, in order by a failure of the network card immediately.
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