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 not available to host databases. Take this into account when choosing a configuration lineup.

You can track the disk fill level using disk fill notifications and metrics. For more information on metrics, see the Monitoring Redis clusters, nodes, and databases guide.

When a cluster's disk is 95% full or more, the cluster will enter a DISK_FULL status and will operate in read-only mode. This is necessary to prevent complete cluster lockout or damage due to lack of free space. To have the cluster work in read and write mode, 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 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%.