FAQ
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I see different kinds of flavors. Which one should I use?¶
There are different kind of flavours with different configuration of CPU, memory and storage. They can mainly be grouped into two different groups: flavours with local ephemeral storage and flavours without. You can see if a flavours comes with local storage or not by viewing the "Root disk" column in the flavour listing. If it says zero, the flavours does not have local storage storage, and if it has a number other than zero it has local storage.
Flavours without ephemeral storage have to be booted from a volume. How to do this is described in Flavors.
Flavours with ephemeral storage have to be booted from an image. This is also described in Flavors.
The table below shows the different combinations:
| Boot Source = Image | Boot Source = Volume | Boot Source = Image and "Create New Volume" set | |
|---|---|---|---|
| Flavour without ephemeral storage (Root Disk = 0) | Invalid - no place to store the image | Valid . Create the volume beforehand under "Volumes" and populate the volume with an image of your choosing | Valid - The volume will be automatically created and populated with the chosen image |
| Flavour with ephemeral storage (Root disk ≠ 0) | Valid - flavour comes with storage which can be used to store the image | Invalid - booting an instance from a volume which already has storage will render an error | Invalid - booting an instance from a volume which already has storage will render an error |
If you get an quota error that looks something like this when you launch your instance, that means that you have tried to launch a flavor which comes with ephemeral storage and also have attached a volume to it by choosing "Create Volume = Yes".
This type of flavor (with Root disk ≠ 0) means that you should not create the volume, and instead leave the "Create Volume = no".