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Using Xervmon for planning and provisioning redundancy across ten-fold availability zonesThe cost of droptimeDowntime costs enterprises money, in fact a great deal of money. The actual cost depends on the industry, but on average the revenue losses amount to between $84,000 and $108,000 for every hour of chance(prenominal) downtime. That isnt the only loss on to that you need to add the intangible costs of the impact of downtime on reputation and loyalty.Managing downtimeThere is a big deviation between scheduled and unscheduled downtime. Scheduled downtime is necessary in order to perform maintenance such as software patches, system configuration changes and database and hardware maintenance. Unscheduled downtime occurs typically as the result of hardware or software misfortune or an event such as a power rationalize or environmental catastrophe. High availabilityDesigning a system for high availability is problematic. Increasing system complexity increases the number of pos sible failure points. Simply installing internal hardware redundancy isnt an answer as it means that the whole system must be taken down for maintenance. It is necessary so design the system so that it can be maintained without affecting service availability. Such a management tool necessitate to satisfy three criteria high availability, fault tolerance and scalability.High availability implies that the uptime of an application is 99.9999%, which is often termed five nines. It equates to a maximum downtime of 5.26 minutes a twelvemonth which includes both planned and unplanned outages or downtime. Of course the ultimate goal is an application that has no downtime at all and is ever available.Xervmon Solution Users can at present unleash the power of visualized deployments with ... ... have been restored. ELB and Auto Scaling combine ideally ELB gives a single DNS name for addressing and auto scaling ensures there is always the right number of healthy Amazon EC2 instances to a ccept requests. Fault ToleranceBuilding fault-tolerant applications on Amazon EC2 requires that the best practices are followed, for instanceCommission electric switch instances rapidlyAmazon EBS should be used for persistent storage Multiple Availability Zones along with elastic IP addresses. Multi AZ architectureBy distributing applications geographically one can achieve greater fault tolerance. As the Amazon EC2 commitment is 99.95% availability for every EC2 Region, it is essential to deploy applications across multiple AZs.Redundant instances are placed in distinct AZs and ELB will automatically balance traffic across multiple instances and multiple AZs.