Limitations and prerequisites

The list of prerequisites includes:

  • The MOS cluster should contain a preconfigured storage class with Ceph as a storage back end.

  • The default sizes of volumes for backups should be configured as follows:

    • 20 GB for the tiny cluster size

    • 40 GB for the small cluster size

    • 80 GB for the medium cluster size

The list of limitations includes:

  • Backup and restoration of specific databases and tables are not supported. MOS supports only backup and restoration of all databases in the mysql data directory.

  • During the MariaDB Galera cluster restoration, the cron job restores the state on all MariaDB nodes sequentially. You cannot perform parallel restoration because Ceph Kubernetes volumes do not support concurrent mounting from different nodes.