Application Availability

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.

Challenge

  • Ensure an uninterrupted application experience in the event one or more servers become overloaded or unresponsive
  • Maintain 24/7 connectivity between corporate networks and the Internet
  • Route requests to redundant data centers in the event of local disruptions
     
  • Increase the frequency of backup and replication to better mirror data and enable more seamless failover to redundant datacenters
  • Enable remote and mobile access to business applications from anywhere
    and any device to ensure business continuity in the event workers cannot get to their place of work

Solution

  • Server load balancing with application and server health checks for maintaining session and transaction persistence
  • ISP and link load balancing for redundant connectivity to the Internet
  • Global server load balancing for seamless fail over of application traffic to alternate data centers in the event of geographic disruptions
  • WAN optimization for accelerating data transmission across wide area networks and reducing the time necessary for backup and replication
  • Scalable, secure remote access with burst licensing for cost-effectively supporting spike usage caused by business continuity events

 

Load Balancing, WAN Optimization and Remote Access for Application High-Availability

Array application availability solutions provide load balancing, backup and failover for servers, WAN links and data centers to ensure applications remain up and running in the event of disruptions large or small. To ensure workers can access applications, even if they cannot get to work, Array remote access solutions support connectivity from any device, anywhere and offer flexible licensing options that make preparing for surge usage both affordable and predictable.

Business disruptions can take many forms, from equipment failures and network outages, to minor events such as sick days, to major events such as extreme weather and natural disasters. Leveraging Array application high-availability solutions, businesses can ensure that core systems are always up and running and workers always have access to the applications and resources essential to accelerating business.

application availability and application high-availability

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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.

WAN Optimization


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.

Remote Access


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.

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