In the OpenStack context the term “flavor” refers to a hardware profile that can be used for a virtual machine. In openstack we have set up various standard hardware profiles (flavors). These have different limits, which are listed below for all available flavors.
Migrating between Flavor Types
To change the flavors of existing instances, the OpenStack “Resize Instance” Option can be used either via the Dashboard or the CLI. This will result in a reboot of the Instance but the content of the instance will be preserved. Please note that changing Flavors from Large Root Disk Types to a Flavor with a smaller Root Disk is not possible.
Flavor-Types
s1 (Standard) Flavors: shared CPU, 1:2 CPU / memory ratio
m1 (Memory-Optimized) Flavors: shared CPU, 1:4 CPU / memory ratio
d1 (Dedicated) Flavors: pinned CPU, 1:8 CPU / memory ratio
g1 (GPU) Flavors: pinned CPU, A100 80GB GPU(s) - only available in SZ1 and no Migration Support
All default flavors are available in all availability zones as well as in SZ1 by default, unless specified otherwise. In addition to the standard variant with a 20GB root disk, we offer a .d variant with a 100GB root disk. Alternatively, any flavor can used with a volume as the root disk.