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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 — 8 GB.

The reserved portion of disk space is not available for hosting databases. Consider this when choosing a configuration lineup.

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