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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 part of the disk space is unavailable for hosting databases. Consider this when choosing a configuration line.

When a cluster node disk is 95% or more full, it will switch to the DISK_FULL status and become read-only. This is necessary to prevent complete locking or corruption of the cluster due to lack of free space. For the cluster node to operate in read-write mode, clean up the disk or scale the node group and select a configuration with a larger disk size than in the previous configuration.

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