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Disk space usage in an OpenSearch cluster

In cloud databases, part of the disk space is reserved for service needs:

  • for the file system — approximately 4% of the disk volume;
  • for the operating system, service components and logs — approximately 8 GB.

The reserved portion of the disk space is not available to host databases. Keep this in mind when selecting a configuration lineup.

When the cluster disk is 95% or more full, the cluster will go to DISK_FULL status and will be read-only. This is to prevent the cluster from being completely locked up or corrupted due to lack of free space. To make the cluster read-write, scale the cluster and select a configuration with a disk size larger than the previous configuration.