Technical and organizational constraints are necessary to ensure the stability and reliability of the platform. Resource restrictions allow platform clients to seamlessly access MCS services.

Quotas

Quotas are organizational restrictions on the operational activity of each project.

Quotas are enforced by granting or booking resources when a request is made, such as when creating a new virtual machine. If the resource cannot be allocated, the request to create the resource is denied. If the backup succeeds, the operation continues until the backup is either converted to use (the operation was successful) or rolled back (the operation failed).

Minimum quotas are assigned to the project when it is created.

There are several types of messages about an insufficient number of quotas in a project:

When creating a resource in the create request window :

* for High-IOPS SSD:

or (for some entities) when trying to create an entity :

Project quotas

The current project quotas can be seen on a separate page. To do this, click on the login in the upper right corner, and select the "Quotas" item in the drop-down menu:

Quotas will be displayed as a graphical information list:

For more information on a specific quota, you can click on the " i " icon on the right:

Base quotas

When a project is created, it is assigned resource quotas that are set by default for all new projects. Each new project does not inherit the available number of quotas from existing projects.

Basic resource quotas are displayed at the top of each service window.

A complete list of quotas in the project can be obtained through the CLI using the command:

 openstack quota show

or separately for each service:

 nova quota-show
cinder quota-show
manila quota-show
neutron quota-show

The standard set of quotas is defined as follows:

Increase in quotas

We will use virtual processor quotas as an example. To request an increase in the virtual CPU quota, you need to decide how many additional virtual CPUs you want to use. Also determine which quotas are required additionally, then create a request to technical support indicating:

• account name
• project number (mcs_pid)
• type of quota
• how much increase is required

Technical limits

The stability of the MCS services is ensured by the appointment of technical limits for the platform. These are general limitations due to the MCS architecture.

The current technical limitations have the following meanings: