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Such behaviour isn't explicitly described in the documentation, but it is confirmed by checking realy EC2 instances. This patch introduces options virt_mkfs as multistring. Its format is --virt_mkfs=<os_type>=<mkfs command> When creating ephemeral device, format it according to the option depending on os_type. This addresses the bugs, https://bugs.launchpad.net/nova/+bug/827598 https://bugs.launchpad.net/nova/+bug/828357
The Choose Your Own Adventure README for Nova: You have come across a cloud computing fabric controller. It has identified itself as "Nova." It is apparent that it maintains compatibility with the popular Amazon EC2 and S3 APIs. To monitor it from a distance: follow @novacc on twitter To tame it for use in your own cloud: read http://nova.openstack.org/getting.started.html To study its anatomy: read http://nova.openstack.org/architecture.html To dissect it in detail: visit http://code.launchpad.net/nova To taunt it with its weaknesses: use http://bugs.launchpad.net/nova To watch it: http://hudson.openstack.org To hack at it: read HACKING To laugh at its PEP8 problems: http://hudson.openstack.org/job/nova-pep8/violations To cry over its pylint problems: http://hudson.openstack.org/job/nova-pylint/violations