Scaling Up Storage Space

Scenarios

As more data is added, you may start to run out of space. If the kernel system detects that the disk usage exceeds 85%, the instance is set to read-only and no data can be written to the DB instance. (85% is the default threshold. You can set the cms:datastorage_threshold_value_check parameter for an instance to change the usage threshold.) This section describes how to scale up the storage space of a DB instance. Services will not be interrupted during storage scale-up.

Precautions

• Within the maximum allowed range, usage cannot exceed 85% of the total storage space after scaling.
• If any node becomes faulty, contact the O&M engineers for troubleshooting before the scale-up.
• The storage space must be a multiple of (Number of shards x 4 GB).
• Each shard can hold up to 24 TB, so 24 TB of storage can be added for each shard added.
• The storage of BMS-based instances using local disks cannot be scaled up.
• If a DB instance is unavailable because the storage space is used up, you can scale up the storage space.

Constraints

• You can scale up storage space only when your account balance is greater than or equal to $0 USD.
• The maximum allowed storage for a single shard is 24 TB by default. There is no limit on the number of scale-ups.
• During storage scale-up, the DB instance is in the Scaling up state and backup services are not affected.
• Reboot is not required during storage scale-up.
• Do not reboot or delete the instance whose storage is being scaled up.
• Storage space can only be scaled up, not down.

Procedure

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

   

3. Click in the upper left corner of the page and choose Databases > GaussDB.
4. On the Instances page, locate the instance you want to scale up and click More > Scale Storage Space in the Operation column.

   Alternatively, click the instance name to go to the Basic Information page. In the Storage/Backup Space area, click Scale.

   Figure 1 Scaling up storage
   

5. On the displayed page, specify the new storage space and click Next.
   Figure 2 Setting the space size
   

   When you scale up storage space, ensure that the usage of the new storage space is less than 85%. Once the storage usage of a DB instance reaches 85% or higher, the instance cannot process write operations and becomes read-only.

6. Confirm settings.
   • If you need to modify your settings, click Previous.
   • If the settings are correct, click Submit.

7. View the storage scale-up results.

   During the scale-up, the status of the instance on the Instances page is Scaling up. This process may take 3 to 5 minutes. Once the scale-up is complete, click the instance name to go the Basic Information page and you can see the new storage space.