High availability of services, when the downtime is less than 5.26 minutes per year (This article has a table that shows the conversion from "nines" to the amount of time a system would be unavailable for various periods.)
Advanced features such as HA and LDAP single sign-on require that the system be configured and installed from source.
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One of the early focuses of Project MAC would be the development of a successor to CTSS, Multics, which was to be the first high availability computer system, developed as a part of an industry consortium including General Electric and Bell Laboratories.
In 1993 they added the Symmetry 2000/x90 along with their ptx/Cluster software, which added various high availability features and introduced custom support for Oracle Parallel Server.
It is a variant of TPF specially designed to provide all the benefits of TPF (very high speed, high volume, and high availability in transaction processing) but with the advantages such as easier integration into the data center offered by running on a standard IBM operating system platform.
GTS is the leading e-business on demand and hosting services provider, according to IDC, Forrester Research, Gartner/Dataquest and Meta Group; the leader in providing high-availability services, networking services and storage services, according to Gartner Group and IDC; the leader in the emerging wireless services market, according to IDC.
In the spring of 2008 the company released everRun VM for Citrix XenServer the first in the series of v-Available products from Marathon Technologies that provides fault-tolerant high availability and disaster recovery protection.