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thin provisioned root disks

Hi In our current setup we provision all vm instance disks thin. we do not use cinder or swift, and all disk images they are located under /var/lib/nova/instnaces

whilst this is good as it saves space I am now starting to worry about the possiblity of over commiting disk space on compute nodes.

How is this handled by Openstack does it keep track of these space claimed by each disk or the space actually used?

Also will openstack stop you from creating new instances if you exceed the theoretical limit (i.e there may be free disk space on the compute node but openstack will not create an instance because if all vm disks where to be filled up there would not be enough space)?

thin provisioned root disks

Hi In our current setup we provision all vm instance disks thin. we do not use cinder or swift, and all disk images they are located under /var/lib/nova/instnaces

whilst this is good as it saves space I am now starting to worry about the possiblity of over commiting disk space on compute nodes.

How is this handled by Openstack does it keep track of these space claimed by each disk or the space actually used?

Also will openstack stop you from creating new instances if you exceed the theoretical limit (i.e there may be free disk space on the compute node but openstack will not create an instance because if all vm disks where to be filled up there would not be enough space)?