db
The storage type of the instance. Valid values:
local_ssd: specifies to use local SSDs. This value is recommended.
cloud_ssd: specifies to use standard SSDs.
cloud_essd: specifies to use enhanced SSDs (ESSDs).
cloud_essd2: specifies to use enhanced SSDs (ESSDs).
cloud_essd3: specifies to use enhanced SSDs (ESSDs).
NOTE: You can specify the time zone when you create a primary instance. You cannot specify the time zone when you create a read-only instance. Read-only instances inherit the time zone of their primary instance. If you do not specify this parameter, the system assigns the default time zone of the region where the instance resides.