In virtualized environments, coordinating the state of the data and the state of the application is challenging. Especially for tier-1 applications, which typically span multiple virtual machines, application protection is not simple. Business-critical applications are more complex in terms of dependencies and infrastructure, have aggressive service-level agreements (SLAs), and require robust and effective recovery processes.
When a multi-tiered application such as SAP, Microsoft Exchange or an ERP instance has several virtual machines supporting it, those virtual machines can be located across disparate hosts and storage arrays, even different processor chip sets – making replication of the full application quite complex.
To learn more and to read the entire article at its source, please refer to the following page, How-to Video: Protecting Applications, Not Just Data- ESX Virtualization - vladan.fr