AnglojÄ™zyczny SEO copywriting stopniowo staje siÄ™ jednÄ… z moich specjalizacji. Jedna z krakowskich firm IT zleciÅ‚a mi pisanie artykuÅ‚ów na bloga w jÄ™zyku angielskim na tematy zwiÄ…zane z ich ofertÄ….
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As recently as 10 years ago, every IT manager felt secure only if he had a new server with next business day support and an up-to-date operating system installed on it. And yes. It used to work. Nowadays, however, no one relies on such basic solutions anymore. Today’s server environments are built as high-availability clusters.
What's in this article?
High-availability cluster is a group of devices which provide continued service when one or more of the system components fail. Such a cluster is managed by dedicated software, such as Vmware vSphere or Microsoft Hyper-V.
In order for the cluster to work, the following conditions have to be fulfilled, in terms of both software and hardware.
Without clustering, if a server running a particular application crashes, the application will be unavailable until the crashed server is fixed. High-availability clustering prevents this situation by detecting faults, and immediately restarting the application on another system. This process, which does not require administrative intervention is known as failover.
The high-availability cluster is resistant to the failure of one element of a given type:
matrix failure does not cause downtime at work, because it is made of two equal controllers in which the configuration is saved and two power supplies;
server failure - each server should be equipped with two power supplies, because these components fail most often, and if another server component fails, the management software will switch resources to a functioning server;
switches – two physical switches are used and organized into one logical entity (stack); when one of them fails, some connections are inactive, but the server environment will still be available."
Joanna Nowak to copywriter i content writer. Swoim klientom - maÅ‚ym i Å›rednim firmom - pomaga przekonywać do wspóÅ‚pracy odbiorców przy pomocy treÅ›ci. WczeÅ›niej redaktorka naczelna PMR Publications