I'm guessing you want to set a total storage quota for volumes and ephemeral. Using only cinder quota doens't give that control as project user may use lots of storage using big flavors. To account for that you need do subtract maximum estimated ephemeral storage usage from the total storage quota you want the project to consume to get cinder quota. To calculate it you might use the following formula:
cinder_quota = total_storage_quota − total_cpu_quota / flavor_min_cpu × flavor_total_disk
For example with 120GB total storage quota and 4 vCPUs
flavor of 1 vCPU and 10GB total storage
cinder_quota = 120GB - 4 vCPU/1 vCPU × 10GB = 80GB
flavor of 2 vCPU and 40GB total storage
cinder_quota = 120GB - 4 vCPU/2 vCPU × 40GB = 40GB
flavor of 4 vCPU and 60GB total storage
cinder_quota = 120GB - 4 vCPU/4 vCPU × 60GB = 60GB
Asked: 2017-04-28 09:18:42 -0500
Seen: 483 times
Last updated: Jul 06 '18
It doesn't look like it. Indirectly: Set quota on the number of instances. Combined with the flavors available to that project the total amount of ephemeral storage is effectively limited.
Ok,
Ok, Thank You Bernd.
So if you understand it correctly, the formula is:
project_max_ephemeral_storage_size = max_number_of_instances * ephemeral_disk_size_in_biggest_available_flavor
and there is no way to set this limit directly?
I made this formula up, but yes, I would think it's correct. And there is no direct way to limit ephemeral storage.
Let me also point you to the quotas section in the Operations Guide.
Ok, Thank You!