OpenStack Quotas
To protect the Cinder volumes, NetBackup for OpenStack creates Cinder snapshots and additional temporary Cinder volumes. The tenant administrator must configure the OpenStack quotas accordingly to provision adequate snapshots and the volumes that full and incremental backups need. The temporary volumes are used to generate disk map information per disk, and to calculate incrementally changed data.
Volume quota requirement is based on the total number of disks getting backed up simultaneously though one or more protections. As the number of simultaneous backups increases, more volume quota is required. Tenant administrator can determine the volume quota by calculating the sum of the total number of instances and the total number of disks that are attached to those instances. For example, you want to protect 10 instances and each instance has two disks attached. To protect these instances simultaneously through one or more protections, the required volume quota is 30.