Typical configurations of instances (virtual machines) for SIM-Cloud

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The client rents a pool of cloud resources and creates its instances there in design mode. For management and control, a graphical web interface is used:

When creating an instance, you must specify its parameters. To make this task easier for the client, we have prepared a set of 32 types of standard configurations.

Important! In SIM-Cloud, only predefined resource configurations (instance types) are provided for instances. It is currently not possible to create a configuration with an arbitrary ratio of cores and memory.

The types of instances that exist in the system fully cover most of the needs for deploying modern systems and services. All available templates comply with the requirements of the NUMA topology for using the processor capacity of hypervisors, which allows the user to get the maximum efficiency of computing resources.

Two groups of instance types are available for SIM-Cloud users:

The name of the instance types corresponds to the configuration, or rather the ratio of cores to RAM. Suppose the type "SIM-C16R128" means that the created instance based on this type will have 16 cores (Cores - "C") and 128GB of RAM (RAM - "R"). This naming approach will help the client quickly figure out which type is needed when planning the deployment of virtual machines.

For most systems and applications of moderate performance, where high clock speed is not required, the instance types from the "Standard Flavors" group will do, their technical parameters are more than enough. Instance types in this family use processors with a base clock speed of 2.3-2.6GHz.

For services and applications that require higher and more consistent vCPU performance, we recommend selecting higher-performance instance types from the Power Flavors family. These instance types are powered by high-performance Intel® Xeon® Gold 6246 processors clocked at 3.3GHz. It is important to note that 3.3GHz is the base clock frequency, at peak loads the processor frequency can reach 4.2GHz - this is the maximum clock frequency obtained using Turbo Boost technology.

You can change the instance type if needed.

Important! Changing the instance type is accompanied by a restart of the instance. This is necessary for the virtual machine to "see" the new resources.

For example, if we want to change the parameters of our virtual machine (increase/decrease the number of vCPU, and RAM), we need to do the following:

  • In the left part of the panel, on the main menu of the control panel, go to the item "Computing resources" → "Instances".
  • After that, a list will open on the right side of the screen with all the instances available in your project. Before changing the instance type, you need to understand that during this procedure, the instance will be rebooted.
  • On the right side of the panel, go to the additional properties of the instance and select the item "Resize instances". Please note that the "Size" column indicates the current type of instance, you must select and install a new configuration.
  • A window will open in which we need to select the one we need from the list of available types of instances; in our example, it will be SIM-C2R8. When you select any type, all its main parameters will be displayed on the right side. At the last stage, click the "Change instance type" button.
  • The process of changing instance parameters has started. In the Status column, the message Type Change/Migration will appear, and in the Task column, an animation window will be displayed with the corresponding informational message, which will report the status of the process.
  • At the final stage, the system will ask you to confirm the change in the tariff plan. You need to confirm this action.
  • After confirming the completed operation, the instance size will change to a new one, and the instance will move to the "Active" status.
  • Next, you can check the new instance settings directly from the operating system itself to make sure that the new settings have taken effect.
When changing an instance type from a smaller configuration to a higher-performance one, you should first check the availability of free resources.

If the configuration exceeds your limits, you will receive an error message. If you have any questions, please contact Customer Care.

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