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Restore a Sharded Cluster from a Snapshot

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  • Considerations
  • Restore a Snapshot

When you restore a cluster from a snapshot, Cloud Manager provides you with restore files for the selected restore point.

To learn about the restore process, see Restore Overview.

The BSON specification changed the default subtype for the BSON binary datatype (BinData) from 2 to 0. Some binary data stored in a snapshot may be BinData subtype 2. The Backup automatically detects and converts snapshot data in BinData subtype 2 to BinData subtype 0. If your application code expects BinData subtype 2, you must update your application code to work with BinData subtype 0.

Tip

See also:

The notes on the BSON specification explain the particular specifics of this change.

The backup restore file includes a metadata file named restoreInfo.txt. This file captures the options the database used when the snapshot was taken. The database must be run with the listed options after it has been restored. This file contains:

  • Group name

  • Replica Set name

  • Cluster ID (if applicable)

  • Snapshot timestamp (as Timestamp at UTC)

  • Restore timestamp (as a BSON Timestamp at UTC)

  • Last Oplog applied (as a BSON Timestamp at UTC)

  • MongoDB version

  • Storage engine type

  • mongod startup options used on the database when the snapshot was taken

Cloud Manager displays a warning next to cluster snapshots taken while the balancer is enabled. If you restore from such a snapshot, you run the risk of lost or orphaned data. For more information, see Snapshots when Agent Can't Stop Balancer.

All FCV databases must fulfill the appropriate backup considerations.

You must ensure that the MongoDB deployment does not receive client requests during restoration. You must either:

  • Restore to new systems with new hostnames and reconfigure your application code once the new deployment is running, or

  • Ensure that the MongoDB deployment will not receive client requests while you restore data.

← Restore Overview