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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 disk space is unavailable for hosting databases. Take this into account when selecting a configuration lineup.

You can track disk usage using disk usage notifications and metrics. Learn more about metrics in the Cluster, node, and database monitoring MySQL sync guide.

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

Disk occupancy notifications

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