Premium ESSDs remove the IOPS ceiling that applies to standard ESSDs. With the I/O performance burst feature enabled, your RDS for MySQL instance can handle workload spikes without requiring a storage capacity expansion. This topic describes how to change the storage type from ESSD to Premium ESSD using the console or API.
This change is irreversible. After you change to Premium ESSD, you cannot switch back to ESSD or change to any other storage type. Test in a non-production environment before applying to production.
Prerequisites
Before you begin, ensure that you have:
An ApsaraDB RDS for MySQL instance with ESSD as the storage type
Impacts
The change takes effect immediately without interrupting existing connections. In most cases, workloads are unaffected. In some cases, IOPS may fluctuate. Schedule this change during off-peak hours to minimize risk.
Usage notes
Scope by edition: The change applies to all nodes in the deployment:
RDS Cluster Edition: all primary and secondary nodes in the cluster
RDS High-availability Edition: the primary and secondary instances
RDS Basic Edition: the single instance
Read-only instances are not affected. To change the storage type of a read-only instance, go to its instance details page separately.
Configuration during the change: Only the I/O performance burst feature can be configured while the change is in progress. Other settings cannot be modified at the same time.
Backup tasks: If a backup task is running when you start the change, the change takes longer to complete. Make sure no backup tasks are running before you proceed.
Billing
The unit prices of an ESSD and a Premium ESSD are different. ESSDs come in the following PLs: PL1, PL2, and PL3. The price difference for the storage type change is displayed on the Change Specifications page.
Within a specific period of time, if an RDS instance handles a large number of I/O operations for a shorter period of time, Premium ESSDs are more cost-effective than PL1 ESSDs, PL2 ESSDs, and PL3 ESSDs.
The unit prices of ESSDs (PL1, PL2, PL3) and Premium ESSDs differ. The price difference for your specific instance is shown on the Change Specifications page before you confirm the order.
Fee for Premium ESSD = Storage capacity fee + I/O performance burst fee + Buffer Pool Extension (BPE) fee + Data archiving fee
For detailed pricing, see Fee for Premium ESSD.
Within a specific period of time, if your instance handles a large number of I/O operations for a shorter period of time, Premium ESSD is more cost-effective than PL1, PL2, or PL3 ESSDs.
Change the storage type in the console
Log on to the ApsaraDB RDS console. In the top navigation bar, select the region where your instance resides. Find the instance and click its ID.
In the Basic Information section, click Upgrade Storage Type next to Storage Type.
On the Change Specifications page, select Premium ESSD for Storage Type. Read the Terms of Service, then click Confirm Order to complete the payment.
The instance status changes to Upgrading. When the status returns to Running, the change is complete.
Change the storage type using the API
Call ModifyDBInstanceSpec with the following parameters:
| Parameter | Value | Description |
|---|---|---|
DBInstanceStorageType | general_essd | Sets the storage type to Premium ESSD. The original storage type must be ESSD. |
BurstingEnabled | true / false | Enables (true) or disables (false) the I/O performance burst feature. |
Do not modify other parameters such as instance type or storage capacity in the same API call.
FAQ
Will my connections drop during the change?
No. The change takes effect immediately without interrupting connections. In a few cases, IOPS may decrease slightly, so schedule the change during off-peak hours.
Is my data preserved after the change?
Yes. Data is replicated from the ESSD to the Premium ESSD. Access continues without interruption after the change.
Can I switch back to ESSD after the change?
No. The change is irreversible. After switching to Premium ESSD, you cannot revert to ESSD or change to any other storage type.