Using disk space in a Redis cluster

In Managed Databases, part of the disk space is reserved for service needs. The total amount of reserved space depends on the version of Redis.

	Redis 6	Redis 8
File system reserve	4% of the disk capacity	4% of the disk capacity
Reserve for the operating system, service components and logs	8 GB	15 GB

The reserved part of the disk space is unavailable for hosting databases. Keep this in mind when choosing a configuration line.

You can track disk usage using disk full notifications and metrics. For more information about metrics, see the Monitoring Redis cluster, nodes, and databases instructions.

When cluster disk usage reaches 95% or more, the cluster switches to the DISK_FULL status and becomes read-only. This is necessary to prevent a complete lockout or corruption of the cluster due to a lack of free space. For the cluster to operate in read-write mode, scale the cluster and select a configuration with a larger disk size than in the previous configuration.

Disk occupancy notifications

Disk space notifications are sent to the email addresses of the Account Owner and Control panel users who are subscribed to the notification category Products and services. Notifications are sent when the disk reaches 80% and 95% capacity.