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When creating a virtual machine, this machine needs to have some specifications. It is for example important to know how many CPU's and how much memory the VM should have access to. In openstack the specifications of a VM is configured by selecting a flavor when the VM is created. The flavor contains information about how many CPU's and how much RAM the VM should have, in addition to how large (and fast) the default disk should be. The flavor can also give access to special resources like GPU's. Our flavors are organized in various classes which are further described in this page.

Be aware that we in 2022 are in a transition-phase from an old naming-scheme to a new naming-scheme.

• The old naming-scheme is documented here.
• The old flavors will be removed during autumn 2022.
• The recommended upgrade-path from old flavors to new flavors is listed here.

The flavor naming format

At its core the flavors in our openstack-platforms are named with the following format: "<prefix>.<basic-specs>". The prefix is used to define what kind of VM it is (is it a prioritized or a regular VM? Does it have support for special CPU functionality or not?), while the "basic-specs" describes how many virtual CPU's and how much memory the VM should have. This results in flavors like so:

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