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Using disk space in a ClickHouse® cluster

In Managed Databases, part of the disk space is reserved for service needs:

  • for the file system — 4% of the disk volume;
  • for the operating system, service components, and logs — 15 GB.

The reserved portion of the disk space is not available to host databases. Take this into account when selecting a configuration lineup.

When a cluster node's disk is 95% full or more, it will switch to DISK_FULL status and will be read-only. This is necessary to prevent a total lock or corruption of the cluster due to lack of free space. To make the cluster node read and write, clean up the disk or scale the node group and select a configuration with a larger disk size than the previous configuration.

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