---
title: "Using disk space in a ClickHouse® cluster"
sidebar_label: "Using disk space"
sidebar_position: 12
description: "How disk space is used in a ClickHouse® cluster"
---

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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](/managed-databases/clickhouse/configurations.mdx).

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](/managed-databases/clickhouse/resize-cluster.mdx#resize-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.

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