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Percona Software for MongoDB Documentation

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System requirements

  • At least 1GB RAM is required to operate successfully.
  • At least 2 logical CPU cores are recommended to reduce the 100% CPU saturation risk during the synchronization period

  • PCSM process must be able to connect to all replica set nodes that could become a new primary. In non-sharded replica set deployments, this means connecting to all the nodes that could become a new primary node. To become a primary, a node must meet the following criteria:

  • have priority greater than 0 and must be able to vote (votes: 1)

  • is not an arbiter (arbiterOnly: false)
  • is not hidden (hidden: false)
  • is not delayed

Docker requirements

When running PCSM in Docker:

  • Ensure the Docker container has sufficient resources allocated (at least 1GB RAM and 2 CPU cores)
  • The container must have network connectivity to all MongoDB cluster nodes (source and target)
  • If MongoDB clusters also run in Docker, use Docker networks or host networking to ensure connectivity
  • See the Run PCSM in Docker guide for steps
Last update: January 29, 2026
Created: January 29, 2026