High Availability
> Why Specify High Availability?
> Why Online Tech for High Availability?
> How to Buy High Availability?
What is High Availability?
High Availability hosting architectures depend upon several design factors to ensure no single points of failure exist. This is true for the data center infrastructure as well as the individual servers and components in the rack. High Availability hosting begins with redundant electrical power connections into a fully redundant power infrastructure and redundant network connections into dual Cisco networks served by multiple Internet feeds.
High Availability can extend beyond power and network availability. Each device in the rack can also be made redundant to further boost uptime - including switches, firewalls, load balancers, storage devices, and servers. Online Tech’s technical experts can help you review your application and discuss your high availability requirements.
Why Specify High Availability?
Simply put, High Availability (HA) increases uptime. HA assures redundant delivery of power and network to your servers to eliminate any single point of failure. All of our dedicated servers are delivered with High Availability power and network at no additional cost. High Availability can be added to colocation services as a option. High Availability options for colocation include:
- High Availability Electrical Power delivers two diverse power feeds to the rack with an automatic transfer switch (ATS) in the rack to manage failover. The ATS is connected to two disparate PDUs (Power Distribution Units) in the data center. The primary PDU is connected to a UPSs (Universal Power Supply), and the secondary PDU is connected to a separate UPS system or an outside utility feed which can bypass the data center power infrastructure entirely. The entire power feed is supported by natural gas or diesel generators. This High Availability design creates inherent redundancy and eliminates the threat that any single failure from the utility power to the server power supply can bring down the server.
- High Availability Network Connectivity is designed to replicate the same level of redundancy as HA power distribution. Multiple Internet service provider feeds are connected into two cross-meshed core routers. Each ISP feed is then connected into a pair of High Availability distribution network access switches. From the High Availability network switch pair, two network drops are supplied to the customer rack environment. Redundant threat management devices can further protect the environment from potential security threats. Each network path is redundant from the ISP to the server removing any potential single point of failure.
To learn more about the details behind High Availability architecture, you can download our whitepaper: The Anatomy of a High Availability Rack.
Why Consider High Availability from Online Tech?
Online Tech starts with a High Availability infrastructure across our multiple Data Centers. Each data center has UPS and generator backed up power systems. Our network of data centers have high availability Internet delivered by multiple Tier1 Internet Service Providers across multiple delivery paths into each data center.
High Availability delivers a number of benefits:
- Increased Power Reliability – The electrical power SLA increases to 99.99% with redundant component power supplies, power strips, and power feeds from diverse PDU’s.
- Increased Network Reliability – The core network SLA increases to 99.95% with redundant network feeds from the Internet to your cabinet.
- Simpler Preventive Maintenance – The High Availability architecture allows for preventative maintenance windows to apply software patches and hardware upgrades to redundant components in your rack.
How to Buy High Availability.
High Availability Power and Network are included at no additional charge with all of our dedicated servers and are options available with our colocation services.
High Availability can extend beyond power and network availability to network security, storage and servers. If you’d like to discuss the high availability requirements of your application with one of our Data Center experts.
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