Using disk space in a Redis cluster

In Managed Databases, some 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 portion of the disk space is unavailable for hosting databases.Take this into account when choosing a configuration lineup.

You can track how full the disk is using disk occupancy notifications and metrics.For more information about metrics, see the Monitoring Redis cluster, nodes, and databases article.

When a cluster disk is 95% full or more, the cluster will enter the DISK_FULL status and will be read-only.This is necessary to prevent a total cluster lockout or corruption due to lack of free space.To return the cluster to read and write mode, scale the cluster and choose a configuration with a larger disk size than the previous one.

Disk occupancy notifications

Disk occupancy notifications are sent to the email of the Account Owner and users who are subscribed to the notification category Services.Notifications are sent when the disk is 80% and 95% full.