high availability


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high availability

Also called "RAS" (reliability, availability, serviceability) or "fault resilient," it refers to a multiprocessing system that can quickly recover from a failure. There may be a minute or two of downtime while one system switches over to another, but processing will continue. This is not the same as fault tolerant, in which redundant components are designed for continuous processing without skipping a heartbeat.

High availability also refers to being able to service a component in the system without shutting down the entire operation. See clustering and hot fix.
References in periodicals archive ?
Several SIOS DataKeeper AMIs are available for purchase on AWS Marketplace, enabling customers to add high availability to an existing deployment or to deploy a two-node SQL Server cluster in AWS.
are excited to provide a solution with the industry's first High Availability
The High Availability (HA) service monitors cloud servers hosted on Host Color Europe, VMware powered cloud infrastructure, to detect a failure on the underlying physical hosts or any Operating System failures inside the Cloud Virtual Machines.
GE s industry-leading high availability control solutions enable companies to meet or exceed their critical facility and operation uptime requirements.
"SIOS worked closely with SAP's Linux Lab to achieve this first of its kind high availability certification," said Scott Armour, COO at SIOS Technology Corporation.
"This center will allow us to offer geographically distinct high availability and business continuity services to our clients," said Dave Wordhouse, vice president of network technologies for WESCO Net, a division of CU*Answers.
Specifically, private clouds introduce abstraction layers which lead to service availability issues such as hidden single points of failure, failing high availability relocations and best practice and SLA violations.
today announced new clustering software for its high-end Hitachi Universal Storage Platform V (USP V) controller, a virtualization engine that enables storage from multiple vendors' arrays to be pooled behind a single management interface.<p>The Hitachi High Availability Manager software allows virtualized pools of storage being managed by the USP V to migrate between storage systems without having to bring down applications or host servers.<p>Claus Mikkelsen, CTO of HDS' Storage Architectures, had attempted to build hype around the announcement by offering a clue as to what the product was a week ago in an anagram on his blog page.
Securiguard Security Services choose NEC Fault Tolerant for cost effectiveness and high availability servicesNew servers to support CCTV and Access Control systems SecuriGuard Tech, one of British Columbia's largest and highly-respected private security organizations, has selected the NEC Express5800/320Fd-MR Fault Tolerant server to ensure highavailability of its security solutions provided to their customers in the UAE.
Although there are developed and accepted industry standards that should ensure protection and high availability of data stored in databases, differences exist in practical implementation of these standards by different DBMS vendors.
This book focuses on Load Balance and High Availability clustering, clearly aiming at the practitioner.
Before examining how iSCSI can enable high availability for an IP-SAN, let's review how an iSCSI storage target (volume) interfaces with the operating systems and file system on the host.

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