Cinder LVM Oversubscription in thin provisioning

目录

Oversubscription in thin provisioning

• Cinder spec: Over Subscription in Thin Provisioning https://review.openstack.org/#/c/129342/12/specs/kilo/over-subscription-in-thin-provisioning.rst
• cinder bp: Over subscription in thin provisioning https://blueprints.launchpad.net/cinder/+spec/over-subscription-in-thin-provisioning

所谓 Oversubscription in thin provisioning，就相当于是 Thin Provisioning Storage Pool 的超分比限制，防止 Thin Provisioning Storage Pool 被无限放大。对应的配置项是 max_over_subscription_ratio，默认值为 20.0。e.g.

[lvm-1]
volume_group = centos
volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver
volume_backend_name = lvm-1
iscsi_help