MDS Autoscaler Module

The MDS Autoscaler Module monitors file systems to ensure that sufficient MDS daemons are available. It works by adjusting the placement specification for the orchestrator backend of the MDS service. To enable, use:

ceph mgr module enable mds_autoscaler

The module monitors the following file-system settings to inform placement- count adjustments:

  • max_mds file system setting

  • standby_count_wanted file system setting

The Ceph monitor daemons remain responsible for promoting or stopping MDS according to these settings. The mds_autoscaler simply adjusts the number of MDS daemons spawned by the orchestrator.