cinder

Cinder was not introduced until the release of OpenStack Folsom in 2012. VM images are ephemeral and their storage only lasts for the life of that VIRTUAL machine. Cinder provides block storage management. It uses iSCSI, Fibre Channel, or NFS protocols, and several proprietary protocols to provide back-end connections to the Nova computing layer. Cinder interfaces provide standard functions that allow you to create and attach block devices to virtual machines, such as Create Volume, Delete Volume, and Attach Volume. There are more advanced features, supporting capacity expansion capabilities, snapshots and creating virtual machine image clones.

Resources overbooked

Add or replace in backend configuration section moduleConf max_over_subscription_ratio = 30.0 grep"max_over_subscription_ratio" -r ./cinder

sed -i "S/rbd_exclusive_CINDER_pool = false/ rbd_exclusive_CINDER_pool = false\nmax_over_subscription_ratio = 50.0/g"  /etc/cinder/cinder.conf


systemctl restart openstack-cinder-api
systemctl restart openstack-cinder-volume
systemctl restart openstack-cinder-scheduler
systemctl restart openstack-cinder-backup


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