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Blog: public cloud computing myths debunked

This is a guest blog from our infrastructure partners Insite.

With the relentless marketing of public cloud by the world’s IT leviathans, it is no surprise that the adoption of Cloud computing continues to grow.

However from our conversations with CIOs and CFOs, it’s clear there are a number of common misconceptions around public cloud solutions.

Here we’ve listed a few of those we hear most frequently, and we go on to explain why we believe not all clouds are created equal:

Myth: public clouds guarantee availability of at least 99.9% of my applications
Reality: public cloud providers guarantee 99.9% availability of their regional platform. If the platform fails, service credits are calculated based on monthly downtime. This guarantee does not extend to individual virtual machines used by subscribers. It is the subscribers’ responsibility to ensure sufficient monitoring and support resources are in place to promote high levels of application availability.

Myth: public clouds are cost effective
Reality: small virtual machines with up to four CPU cores and 32GB of RAM are cost effective. However, virtual machines with more than eight CPU cores and 56GB memory can be poor value when compared to alternative solutions. Virtual machines with more than 16 CPU cores can be eye-wateringly expensive. Equally, storage with throughput comparable to mid-range storage arrays, required by company-wide applications, costs extra, as does internet connectivity.

Myth: there is always someone available with whom to log issues
Reality: In the majority of cases, public cloud providers do not operate a service desk that can be contacted by phone. Their strong (and often only) preference is for customers to log issues using a portal, which can be frustrating when systems are down and senior management are demanding answers. Once an issue is logged, the service level agreement does not provide response and fix targets, or any detailed feedback on why the issue occurred.

Myth: public clouds allow me to reduce IT resources
Reality: public clouds provide Infrastructure-as-a-Service (IaaS), whereby virtual servers and storage are rented. The subscriber needs to install, manage, monitor, secure and support software applications as if they were located on premise, so IT resources need to be retained/recruited.

For the complete list of myths, visit LinkedIn.

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