Backing up OpenStack data
OpenStack data is backed up in parallel streams wherein OpenStack project instances stream data blocks to the NetBackup media server through the backup hosts.
The following diagram provides an overview of the backup flow:
As illustrated in the above diagram:
A scheduled backup job is triggered from the master server.
Backup job for OpenStack data is a compound job. When the backup job is triggered, first a discovery job is run.
During discovery, the first backup host performs a discovery to get details of data that needs to be backed up.
A workload discovery file is created on the backup host. The workload discovery file contains the details of the data that needs to be backed up from the different instances.
The backup host uses the workload discovery file and decides how the workload is distributed amongst the backup hosts. Workload distribution files are created for each backup host.
Individual child jobs are executed for each backup host. As specified in the workload distribution files, data is backed up.
The compound backup job is not completed until all the child jobs are completed.