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

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