Skip to main content

Using disk space in a ClickHouse® cluster

Last update:

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 disk space is unavailable for hosting databases. Please consider this when selecting a configuration lineup.

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

ClickHouse® is a registered trademark of ClickHouse, Inc. https://clickhouse.com.