Communications/Telemetry
Data replication ensures optimum quality of service all the way to the edge of the enterprise where connectivity is intermittent or limited, says Steve Driver.
La replicación de datos garantiza una óptima calidad de servicio que se extiende hasta el extremo de la empresa donde la conectividad es intermitente o limitada, declara Steve Driver.
Durch Datenreplikation wird eine optimale Dienstgüte bis in die äußersten Unternehmensbereiche gewährleistet, wo die Verbindung unterbrochen oder beschränkt ist, so Steve Driver.
Overcoming the challenge of poor internet connectivity at remote sites
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Fig. 1. Oil and Gas companies encounter issues when attempting to keep remote sites or workers up to date with essential data.
eographic remoteness and poor connectivity mean many oil and gas organisations encounter issues when attempting to
keep remote sites or workers up-to-date with essential data. Te problem of inconsistent connectivity and limited bandwidth is compounded by the trend towards ever- more distributed enterprises. Te growing number of mobile workers and remote sites spanning home, branch, regional and international offices, has meant the centralised architectures employed by most business applications today are out of sync with the distributed enterprise. Latency is a major source of frustration for users of remote applications. Network outages and connectivity issues aside, the fact that an application must communicate via a network during its operation introduces noticeable delays in processing and usability – even over high-speed networks. Te effect becomes more pronounced as the distance between
the user and the data centre increases. Where organisations are attempting
to run applications locally at remote sites that use large database systems such as Microsoft SQL, Oracle, or IBM DB2 at head office, it can be almost impossible to achieve the level of quality of service (QoS) required to keep the local instance (the slave) in sync with the central database (the master). Tis is why a fundamental change in the way business applications are architected is required by users such as oil and gas operators. Tere are several ways in which to
provide improved access to applications and data. Te first step is to recognise the internet’s inability to provide reliable access, and change its role in the application architecture from ‘mission- critical backbone’ to ‘occasionally needed service’. Based on this approach, there are four core technology options:
l N-Tier Client Server – closest to the traditional, in-house, centralised application environment, this scenario involves a central database server and deployment of robust client applications at each remote site or user location. Network connectivity is essential, with performance tied to available bandwidth and reliability
hinging on network availability; l Tin Client ‘Application Access Portals’ – a remote control operation where network dependant terminals access one or more central servers. Each user has their own virtual machines running on these central servers, on which the applications are loaded and executed. Regardless of bandwidth requirements, network connectivity is necessary to use the application. Latency may be an issue as keystroke and GUI data must be sent
between the thin client and the server; l Web Client – encompasses several
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