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Failure
Published in Nikhilesh Krishnamurthy, Amitabh Saran, Building Software, 2007
Nikhilesh Krishnamurthy, Amitabh Saran
Two approaches are used: (1) fail-over and (2) fail-safe (Figure 1.6). Failover means detecting a system failure and migrating the functionality of the failed system to a backup system. For example, in most infrastructure networks (e.g., power grids or telecom lines), the loads carried by each substation or node are dynamically redistributed. The strategy states that that if a node is unavailable due to failure, the load it carries is rapidly distributed to the other nodes on the network. Similarly, in fault-tolerant machines or redundant servers, there is more than one intelligent controller connected to the same device. In the event of a controller failure, failover occurs and the survivor takes over its I/O load.
Financial analysis for mobile and cloud applications
Published in Noura Metawa, Mohamed Elhoseny, Aboul Ella Hassanien, M. Kabir Hassan, Expert Systems in Finance, 2019
Jennifer Brodmann, Makeen Huda
Availability of cloud-based applications is also a topic of concern. If an outage occurs in the cloud, this will result in users not having access to their applications. Typically, cloud vendors offer a 99.5% or more service level commitment to their users. In addition, through economies of scale cloud vendors can invest in several levels of failover and redundant systems to reduce system outages. Cloud computing users can also be subject to a “noisy-neighbor” effect, when a neighbor’s applications can use an outsized share of computing resources, such as processing and memory, which then takes away these resources from the user. Cloud security providers are not required to share this information.
Reliability and Server Failover
Published in Hubbert Smith, Data Center Storage, 2016
Server failover deployment can be significantly improved with the employment of virtual servers and virtual storage. The configuration of the primary server can be captured and cloned for the secondary server. The term server configuration cloning is also referred to as bare metal configuration. Since the data is on the storage array (or replicated by a primary storage array to a target storage array), cloning configurations significantly improves confidence in rapid deployment of server failover and confidence that server failover will actually work when the time comes.
Review of battery powered embedded systems design for mission-critical low-power applications
Published in International Journal of Electronics, 2018
Matthew Malewski, David M. J. Cowell, Steven Freear
Failover systems are a form of redundancy in which a secondary system will continue the operation of the primary system when the primary system experiences a failure. The failover system can either provide all, or just the core functionality of the primary system (Sun, Gong, Dong, Zhang, & Wang, 2014). The practice of implementing a failover systems is commonly used in other fields, such as web-servers in IT (Plankis, Horning, Ponto, & Brown, in press).