About Us

High-Availability’s flagship High Availability Cluster product, RSF-1, has been a trusted commercial Unix failover technology since 1995 and has been widely deployed as the “HA plugin” of choice for many critical applications, databases and enterprise services across many Unix, Linux and BSD platform variants to provide enhanced enterprise-grade service availability.

Since 2009, we have worked extensively with the ZFS file-system in collaboration with the world’s leading Software Defined Storage vendors to provide the highest levels of data protection for critical storage system availability demands.

In addition to licensing its software products, High-Availability offers a comprehensive suite of Professional Services to assist its customers and resellers with both pre-sales and post-sales application and technical requirements.

High-Availability also operates a 24×7 support organization to help ensure that its customer’s mission-critical applications and services continue to be highly available.

For over twenty years, our technology has continued to keep pace with evolving enterprise platforms, technologies and evolving customer needs to ensure we provide the highest levels of service availability to enterprise customer needs.


UK-based High-Availability.com was formed in 1995 as an offshoot project to a Sun Enterprise consulting business setup by Grenville Whelan and Paul Griffiths in 1994.

The original concept came from an extraordinary incident in Manchester, England that rendered the Head Quarters and IT infrastructure of a 100-year old insurance customer inaccessible for a week. At the time, the founders were providing Sun enterprising consulting services to this client who realised that they needed a comprehensive Disaster Recovery capability in the event of a similar future catastrophe, without which the continuous operation of their IT infrastructure would have significantly threatened the ability for the business to survive.

As there were no appropriate commercial High Availability solutions available on the Sun enterprise systems at that time, the founders designed, conceived and developed the first commercial High Availability product for Solaris, RSF-1. This very first version (providing failover services to SPARCCentre 2000 and 1000 clusters) ensured the client’s Ingres-based bespoke applications were Highly Available with fully automated failover in the event of failure.

As more interest came from other enterprise Sun users, High-Availability.com was formed as a separate business. Product development and customer take-up increased with many early implementations ordered on customers behalf by Sun Microsystems. During these early days, most RSF-1 implementations protected various bespoke and third-party applications based on Oracle, Ingres and Sybase databases on Sun SPARC Solaris enterprise systems. A Linux version was also released in 1996.

Customers liked the product’s flexible and uncomplicated yet powerful, effective and robust design and that it “did exactly what it says on the tin”. Over the next few years, RSF-1 proved itself to be reliable, effective and bullet-proof and trusted by a wide range of customers with mission-critical needs including: banks, government, emergency services, manufacturing, education and retail.

Over time, more applications were integrated with RSF-1 and large notable rollout deployment successes included delivery of highly available application services to Checkpoint Firewall-1 on Solaris, Oracle DB on Red Flag Linux and MySQL on Linux.

Since 2009, we have worked extensively with the ZFS file-system and have partnered with a number of ZFS Open Storage vendors including Nexenta and Coraid.

Today, with over 23 years experience and thousands of proven mission-critical enterprise deployments globally, we continue to evolve and improve RSF-1 for ZFS. With releases on most Unix variants including: Solaris, OpenIndiana, illumos, OmniOS, FreeBSD and Linux, we have delivered over 4,000 RSF-1 for ZFS clusters on these platforms around the world through OEM partners, resellers and directly.