doc-exports/docs/dms_rocketmq/umn/hrm-ug-038.html

Modifying RocketMQ Specifications

After creating a RocketMQ instance, you can increase or decrease its specifications. Table 1 lists available modification options. Only one object can be modified at a time.

Table 1 Specification modification options

Modified Object	Increase	Decrease
Storage space (single-node)	√	×
Instance flavor (single-node)	×	×
Storage space (cluster)	√	×
Instance flavor (cluster)	√	√ (Only some flavors can be decreased. See the console.)

Impact

Increasing the storage space and instance specifications does not affect services.

Prerequisites

• The RocketMQ instance is in the Running state.
• The user to modify instance specifications must have the DMS FullAccess permission.

Expanding the Storage Space

1. Log in to the console.
2. Click in the upper left corner to select a region.

   DMS instances in different regions cannot communicate with each other over an intranet. Select a nearest location for low latency and fast access.

3. Click and choose Application > Distributed Message Service for RocketMQ to open the DMS for RocketMQ page.
4. Modify the instance specifications in either of the following ways:
   • Locate the row containing the desired instance, choose Modify Specifications.
   • Click a RocketMQ instance name to go to the instance overview page. In the upper right corner, click Modify Specifications.

5. Select Storage for Change By and enter a storage size.
6. Click Next.
7. Confirm the information. If Billing Mode is Yearly/Monthly, click Pay Now. If Billing Mode is Pay-per-use, click Submit.
8. The instance is in the Changing state on the RocketMQ instance list page.

   When the instance is in the Running state, the expanded available storage space can be viewed in Used/Available Storage Space.

   

   Available storage space = Actual storage space – Storage space for storing logs – Disk formatting loss

   For example, if the storage space is expanded to 700 GB, the storage space for storing logs is 100 GB, and the disk formatting loss is 7 GB, then the available storage space after capacity expansion will be 593 GB.

Increasing an Instance Flavor

Before scaling the instance, ensure that the subnet segments are allowed in the security group.

1. Log in to the console.
2. Click in the upper left corner to select a region.

   DMS instances in different regions cannot communicate with each other over an intranet. Select a nearest location for low latency and fast access.

3. Click and choose Application > Distributed Message Service for RocketMQ to open the DMS for RocketMQ page.
4. Modify the instance specifications in either of the following ways:
   • Locate the row containing the desired instance, choose Modify Specifications.
   • Click a RocketMQ instance name to go to the instance overview page. In the upper right corner, click Modify Specifications.

5. Select Flavor for Change By and select a new instance flavor.
6. Click Next.
7. Confirm the information. If Billing Mode is Yearly/Monthly, click Pay Now. If Billing Mode is Pay-per-use, click Submit.
8. The instance is in the Changing state on the RocketMQ instance list page.

   When the instance is in the Running state, view the new instance flavor in Flavor.