Linux is non-stop at Stratus and Availigent

* Fault-tolerant Linux

In server management, there's no such thing as a happy abend-ing (as in abnormal ending, or system crash). And you don't have to tell that to server hardware/software vendors Stratus Technologies or Availigent. Both companies recently launched hardware and software products aimed at keeping Linux servers running constantly.

Stratus, which makes fault-tolerant server hardware, said last week that it is adding Red Hat Linux Advanced Server 4 to its ftServer product line, which previously only supported Windows. Stratus makes server hardware with built-in redundancy - basically, two servers running in parallel inside the same box.

The redundant processors, memory and other components process the same data and allow the devices to keep operating in case of hardware failures, the company says. That makes the products popular with public safety, telecommunications and hospital deployments. Custom ASICs provide error detection and orchestrate the failover transfer of components, the company says. This allows the systems to run full operation at 99.999% over a 12-month period, with 5.25 minutes of downtime a year.

Availigent takes the software approach to five-nines and Linux. The company's Duration software acts as a safety net for Linux server operating system software and the apps running on top of the platform, the company says. The software monitors memory and CPU processes for failures, checks the availability of applications and provides recovery services that do not require a server reboot, the company says. The software also provides server failover and client redirection services for server hardware or network-based failures.

New from Availigent this month is support for HP's XC System - a specialized Red Hat-based Linux distribution and clustering system for HP Integrity and ProLiant servers. The Availigent/HP XC System integration allows the XC System-based clusters to add more application-level failover and fault-tolerance, on top of the operating system-level and hardware-based fault-tolerant features already included in the XC System architecture.

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Copyright © 2006 IDG Communications, Inc.