Application high-availability requires that business-critical processes continue to run and users continue to experience uninterrupted access in the event of planned and unplanned circumstances. From server load balancing, link load balancing and global server load balancing, to WAN optimization for back-up and recovery, to remote access for business continuity, solutions for application availability play a critical role in guarding profitability and maintaining workforce productivity.
Load Balancing, WAN Optimization and Remote Access for Application High-Availability
Server Load Balancing
Server load balancing improves application availability by intelligently directing Layer 2-7 traffic based on a broad range of application metrics and health checks. In addition to distributing traffic loads and directing requests away from overloaded or unresponsive servers, Array load balancer solutions support Layer 4 connection persistence, Layer 7 application persistence and site-level persistence for ensuring the continuity of client sessions and online transactions.
LLB & GSLB
For many applications, connectivity to the Internet is essential. To ensure an always-on connection from the corporate network to wide area networks, Array link load balancers distribute traffic across multiple WAN links, detect and monitor ISP link outages and failures in real-time and instantly redirect individual WAN connections across other available links. And create a backlink for link load balancers. In addition, link load balancing algorithms may be set to utilize select links during select time periods for maximum cost-efficiency.
Deploying applications at a single location can limit availability and introduce latency for geographically distant users. Lone datacenters also create the possibility for natural disasters, human error and equipment failures to bring down applications. Array global server load balancing transparently direct requests away from failed datacenters by continuously monitoring the health of both servers and data centers. In addition, global server load balancing can be configured to distribute requests between geographically separated datacenters based on the proximity and the language of users, Web site capacity and current response times.
Redirecting users to unaffected datacenters in the case of network congestion or business continuity events requires that data centers be in sync, which in turn requires backup and replication. However, because backup and replication commonly occur during non-peak hours to avoid consumption of all available bandwidth, it is not uncommon for data centers to be out of sync. Array WAN optimization reduces the bandwidth required to send data over wide area networks and reduces the time needed to back up and replicate data, allowing applications to sync with greater frequency for more seamless failover between redundant data centers.
Applications that are up and running in the data center are of little use if they are not accessible to users. In the case of natural disasters and unforeseen events, users may not be able to get to their place of work or may not have access to corporate issued devices. Secure remote and mobile access is therefore essential to application high-availability. Array secure access solutions seamlessly scale to accept any number of remote and mobile users without administrator intervention, offer flex licensing to cost-effectively accommodate spike usage and support a range of secure access methods to ensure ease-of-use and compliance during chaotic business continuity events.