Expose Disk Cachemodes Setting

Registered by Mark T. Voelker

When using libvirt with Nova, in some situations it can substantially improve instance boot times if the "disk_cachemodes" directive in nova.conf contains "file=writethrough". That setting is a list as per:

http://docs.openstack.org/havana/config-reference/content/hypervisor-configuration-basics.html

However, the current puppet manifests don't expose this option. As we now have at least one customer asking for it, we should expose the parameter in puppet-nova and document it in one of our yaml files.

Blueprint information

Status:
Complete
Approver:
Mark T. Voelker
Priority:
Low
Drafter:
Mark T. Voelker
Direction:
Approved
Assignee:
Mark T. Voelker
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
milestone icon h.2
Started by
Mark T. Voelker
Completed by
Mark T. Voelker

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