Case Studies 15/09/2021

SIM-Cloud IaaS as a tool for the preliminary estimation of IT capacities needs before building a private cloud

We tell in this case study about the way of SIM-Cloud public cloud infrastructure can be used to estimate the IT resources requirement before creating private cloud infrastructure.


One of our customers was interested in the private cloud creating and migration there his business infrastructure. However, before the private cloud creation, our customer stated his willingness to estimate the real loading of computing resources, which were necessary to use in deploy and efficient working his business.

SIM-Networks offered him to use cloud solutions scalability as an estimation tool to test and measure computing capacities loading. For this purpose, we’ve decided preliminary deploy the customer’s IT infrastructure in public IaaS SIM-Cloud to test its loading and measure an actual need in capacities. This way, our customer could prevent unreasonable expenses ordering server and communication equipment, and software for the private cloud building. So, the project stages were the following:

  • Start working in public IaaS
  • Scaling capacities accordingly to the business growth and its clients base expand
  • Stabilization of business, and measurement of the real loading of actual IT infrastructure resources
  • Specification requirements emendation, the private cloud creation, and customer’s IT infrastructure migration from the public to private cloud

As the business grows, the private cloud computing resources can be scaled and optimized flexibly. Dedicated IT capacities, and flexible infrastructure operation, and high-level physical and legal data protection, as well as backup service settings to the remote from the main infrastructure data center in Germany, our client considered as key benefits of a private cloud.


  • To deploy some instances (VMs) in the public cloud taking into account the infrastructure scaling as our client’s business grows;
  • Adapt special operating systems images which are not included in the standard OS pool allowed by SIM-Networks to implement in the cloud IaaS;
  • Dedicate an IP addresses pool (IPv4 + IPv6);
  • To organize backup using Backup-as-a-Service;
  • To migrate the customer’s business infrastructure to the private cloud from the public cloud.

IT infrastructure scheme proposed by SIM-Networks technical experts


Engineers of SIM-Networks learned the customer’s business process specifics, and carried out an audit both current and planned to deploy services. As a result, our tech experts prepared a detailed work plan for creating the cloud IT infrastructure.

The first stage of the project: we’ve deployed the customer’s infrastructure from scratch in public IaaS SIM-Cloud. The customer started his routine working processes, and we were testing cloud computing load.

Usually, SIM-Cloud uses Floating IP to get access to the instance, as it works with the NAT, Network address translation, that allows transformation private IP addresses of clients’ subnets into public IP addresses while the Internet connection. In this business-case, our customer has preferred to use the specific communication software, the SIP telephony, based on the Session Initiation Protocol. But this solution cannot work correctly with the NAT. So, we’ve decided to dedicate a pool of direct IPv4 + IPv6 addresses to this infrastructure project.

The second stage of the project: we scaled up the cloud infrastructure flexibly following the customer’s business growth and his clients’ base expanding. We added additional computing capacities on our customer’s demand taking them from the SIM-Networks cloud resource pool – processor cores, RAM, drive space, virtual local network IP addresses. As it was pointed in the Customer’s requirements specification, we’ve set data backup and data transfer to the remote data storage using SIM-Cloud BaaS (Backup-as-a-Service).

The third stage: all of the working processes of the customer’s business in the public cloud are stable, and the customer is satisfied with the new corporate infrastructure deployed in the cloud. We reviewed the actual loading of the capacities. Based on our results of the review, we estimated the maximum amount of necessary resources for the near-term prospect to guarantee stable servicing of the clients’ base without downtime. Also, we offered the customer some variants of data analysis and a safe store to reduce IT infrastructure costs.

The fourth stage: we’ve created the private cloud using the specification data sheet about equipment and software based on the 3rd stage results. Then we’ve migrated IT infrastructure to the private cloud from the public IaaS SIM-Cloud.

Essential benefits of the private cloud pointed by the customer:

  • Flexible managing and full functionality due to the sole usage of dedicated computing resources
  • Inaccessibility from the public cloud and other users
  • High quality of safe analysis and store personal data


We use public IaaS SIM-Cloud, deployed in German datacenter as an estimation tool for the preliminary estimate of IT capacities needs before building a private cloud. Testing the public cloud deployment of the infrastructure allowed our customer to get reliable information about the actual infrastructure loading and forecast the scale of capacities as the business grow further.

Analyzing the results of scaling up the temporary IT infrastructure deployed in a public cloud, SIM-Networks experts have prepared a specification for software and equipment for a private cloud, taking into account the prospects for the customer’s business growth. This specification allowed the customer to build a private cloud infrastructure without extra financial costs.

Backup and transfer to the remote data storage using SIM-Cloud BaaS is an outstanding solution to guarantee data safety.

IT infrastructure migration to the private cloud from the public IaaS was performed with almost no downtime in the business process of the client.

User interfaces to manage public and private cloud infrastructure are identical, so, after the migration to the private cloud, the staff of the customer’s company didn’t waste time to training.




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