# 3.5. Disk Monitor Configuration

Apache CouchDB can react proactively when disk space gets low.

## 3.5.1. Disk Monitor Options

[disk_monitor]

  Added in version 3.4:

  background_view_indexing_threshold

    The percentage of used disk space on the `view_index_dir` above which CouchDB will no longer start background view indexing jobs. Defaults to `80`.

        [disk_monitor]
        background_view_indexing_threshold = 80

  interactive_database_writes_threshold

    The percentage of used disk space on the `database_dir` above which CouchDB will no longer allow interactive document updates (writes or deletes).

    Replicated updates and database deletions are still permitted.

    In a clustered write an error will be returned if enough nodes are above the `interactive_database_writes_threshold`.

    Defaults to `90`.

        [disk_monitor]
        interactive_database_writes_threshold = 90

  enable

    Enable disk monitoring subsystem. Defaults to `false`.

        [disk_monitor]
        enable = false

  interactive_view_indexing_threshold

    The percentage of used disk space on the `view_index_dir` above which CouchDB will no longer update stale view indexes when queried.

    View indexes that are already up to date can still be queried, and stale view indexes can be queried if either `stale=ok` or `update=false` are set.

    Attempts to query a stale index without either parameter will yield a `507 Insufficient Storage` error. Defaults to `90`.

        [disk_monitor]
        interactive_view_indexing_threshold = 90