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High Availability E-mail

Overview and Benefits

For many Enterprises, computing systems have become such an integral part of their company's business that severe consequences can occur when their systems are unavailable. These systems are used for critical business functions such as order processing and tracking, inventory control, transaction processing, customer support, and electronic commerce. And when these critical functions are not accessible it can result in lost revenue, lost productivity, reduced customer satisfaction, possible data loss or reduced decision making capabilities. As a result, in today's global environment, these computing systems must be available 24 hours per day, 365 days per year.
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Improved availability must balance the cost of downtime against the cost of any proposed solution to find the most cost-effective method of availability. The first consideration should be the basic quality and reliability of the server (to minimize failures). Suntel has designed a broad array of redundant features to maximize a server's availability. High Availability Clusters provide the next level of availability to further increase business critical applications availability.

Suntel's strategy is to provide clustered solutions that are built with industry standard commodity based components, which deliver high-end availability solutions. The high-end cluster have all been designed to remove all single points of failure. Each cluster level provides the ability to recover from additional failures, thus protecting against many multiple component failures. By removing failure points, higher levels of availability can be achieved. Thus, customers can now use the same build to order model they have become accustomed to with Suntel servers, to build the availability level that best meets their high availability requirements.

Reliability

HA clusters usually utilize all available techniques to make the individual systems and shared infrastructure as reliable as possible. These include:

Disk mirroring so that failure of internal disks does not result in system crashes

Redundant network connections so that single cable, switch, or network interface failures do not result in network outages

Redundant Storage area network or SAN data connections so that single cable, switch, or interface failures do not lead to loss of connectivity to the storage (this would violate the share-nothing architecture).Redundant electrical power inputs on different circuits, usually both or all protected by Uninterruptible power supply units, and redundant powersupply units, so that single power feed, cable, UPS, or power supply failures do not lead to loss of power to the system.

These features help minimize the chances that the clustering failover between systems will be required. In such a failover, the service provided is unavailable for at least a little while, so measures to avoid failover are preferred.

Suntel provides pervasive, cost-effective failover protection within your IT environment.

  • Protect applications with no other failover options and make high availability possible for software applications that might otherwise be left unprotected.
  • Protect applications from OS related failures by automatically restarting machines when failure is detected (experimental mode).
  • Establish a consistent first line of defense for your entire IT infrastructure.

Your Comprehensive High Availability Solution

Suntel provides an end-to-end high availability solution for Enterprises of all sizes that will fit your business requirements and IT budget.

Suntel supports every major Windows,Linux,Unix-based application, including Microsoft Exchange,SharePoint,SQL Server,File Server,mysql,asterisk,pgsql,apache,tomcat, IIS,mssql,xen,RIM BlackBerry, IBM Lotus Domino,Vmware VirtualCenter and more.An added layer of powerful functionality is offered through our optional Low Bandwidth Module -a data compression tool, and all plug-ins include our Data Rollback Module.