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Daemons

This page lists all active Backup Daemons and provides configuration options. Ops Manager automatically detects Backup Daemons and displays them here. You can reconfigure daemons from this page. Changes can take up to 5 minutes to take effect.

Click Pre-Configure New Daemon at the bottom of the page if you want to add a daemon but do not want it to take new jobs. Type the <machine>:<roothead path> in the text field above Pre-Configure New Daemon. Click the button to configure the new Backup Daemon.

For each daemon, the page lists the server name, configuration, head space used, head space free, the number of replica sets backed up, the percentage of time the Backup Daemon Service was busy, and job runtime counts by 1 minute, 10 minutes, 60 minutes, less than or equal to 180 minutes, and greater than 180 minutes.

The page includes the following fields and links to manage and configure daemons:

Item Action
Show Detailed JSON Click this link to display the Backup Daemon JSON. When the JSON displays, the View raw runtime data link appears following the code to view the raw data.
Move all heads

Click this link to move all the Backup Daemon jobs that live on this daemon to a new daemon location.

  1. Click the link.
  2. Click the location.
  3. Click Move all heads.
Delete Daemon Click this link to delete the Backup Daemon.
Assignment Select this to allow the daemon to process more jobs. If the daemon’s disk fills, clear this so the host is not overloaded.
Backup Jobs Select this to allow the daemon to process more backup jobs. Clear this when performing maintenance on a daemon’s host.
Queryable Restore Jobs

Select this to allow the daemon to process queryable backups.

Note

For the fastest possible restore time, configure a dedicated queryable restore daemon by selecting Queryable Restore Jobs and clearing the checkboxes for the other daemon roles, for example, Garbage Collection and Resource Usage.
Resource Usage

Select this to collect data for this daemon. This includes the following data for each backup job run on this daemon:

  • project
  • storage that head database uses
  • storage that the snapshot store uses
  • oplog operations

Navigate to the Resource Usage page to review the collected data.
Garbage Collection Select this to allow the daemon to schedule groom jobs to remove unused blocks and expired snapshots.
Head Disk Type

From this menu, select SSD or HDD storage.

If you select SSD, Ops Manager sends jobs to this daemon only when:

  • The job generates a volume of oplog data that meets or exceeds a threshold of 1 GBph, or
  • Ops Manager has no available HDD daemon to handle the job.
Assignment Labels Type one or more labels that can be used to assign the daemon to a specific project.
Number of Workers

Type the number of concurrent backup tasks this daemon should process at one time.

To query a snapshot of a sharded cluster, the Backup Daemon requires at least one worker for the config server, one worker for each shard, and one worker for each mongos instance.

To query a snapshot of a replica set, the Backup Daemon requires at least one worker for the replica set.

Example

If you restore a queryable backup from a 3-shard cluster with 1 shard router (mongos), you would need this value to be at least 5:

  • 1 per shard (3) +
  • 1 for the config server (1) +
  • 1 for the mongos

When the queryable backup begins, the Backup Daemon spins up 5 or more workers to manage these components.

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