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Using disk space in a MySQL sync cluster

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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 — 8 GB.

The reserved portion of the disk space is not available to host databases. Take this into account when selecting a configuration lineup.

You can track disk occupancy using disk occupancy notifications and metrics. Read more about metrics in the Monitoring clusters, nodes, and databases MySQL sync guide.

When cluster disk space reaches 95% or more, the cluster will enter a DISK_FULL status and will be switched to read-only mode. This is necessary to prevent complete locking or damage to the cluster due to a lack of free space. To restore read and write access, scale the cluster and select a configuration with a larger disk size than the previous one.

Disk occupancy notifications

Disk usage notifications are sent to the email addresses of the Account Owner and users who are subscribed to the notification category “Services and Products”. Notifications are sent when disk usage reaches 80% and 95%.