Configuring Read Replica

Users can enter required information for Read Replica through Samsung Cloud Platform Console and create the service through detailed options.

Configuring Replica

Through Replica configuration, you can create replica servers for read-only or disaster recovery purposes. You can create up to 5 Replicas per Database.

Follow these steps to configure Replica.

1. Click All Services > Database > MariaDB(DBaaS) menu. You will be taken to MariaDB(DBaaS)’s Service Home page.
2. Click MariaDB(DBaaS) menu on the Service Home page. You will be taken to the MariaDB(DBaaS) List page.
3. Click the resource for which you want to configure Replica on the MariaDB(DBaaS) List page. You will be taken to the MariaDB(DBaaS) Detail page.
4. Click Replica Configuration button. You will be taken to the Replica Configuration page.
5. Enter information in the Replica configuration area and click Complete button.

   Category	Required	Description
   Region	Required	Region to configure Replica Only exposed when Replica Configuration (Other Region) is selected
   Replica Count	Required	Number of Replicas to configure Can configure up to 5 per cluster If selecting a value of 2 or more, additionally enter Replica name and service type information
   Replica Name	Required	Replica server name Enter 3-19 characters starting with English lowercase letters, using lowercase letters, numbers, and special characters (-) The entered Replica name is exposed as cluster name in the list
   Service Type > Server Type	Required	Replica server type Standard: Standard specifications commonly used High Capacity: Large capacity server with 24vCore or more (to be provided later)
   Service Type > Planned Compute	Optional	Resource status with Planned Compute set In Use: Number of resources in use among those with Planned Compute set Set: Number of resources with Planned Compute set Coverage Preview: Amount applied with Planned Compute per resource Planned Compute Service Create: Move to Planned Compute service application page For details, refer to Applying for Planned Compute
   Service Type > Block Storage	Required	Block Storage settings used by Replica DB Basic OS: Area where DB engine is installed DATA: Storage area for table data, archive files, etc. Applied identically with the Storage type set in the original cluster Capacity setting not possible Additional: DATA, Archive, TEMP, Backup data storage area Applied identically with the Storage type set in the original cluster In Replica, only DATA, TEMP purposes can be added Select Use and enter storage purpose and capacity To add storage, click + button, to delete, click x button Capacity can be entered in multiples of 8 within the 16-5,120 range, and can create up to 9 including the number set in the original cluster
   IP Access Control	Optional	Service access policy setting Since access policy is set for IPs entered on the page, separate Security Group policy setting is not required Enter in IP format (example: 192.168.10.1) or CIDR format (example: 192.168.10.0/24, 192.168.10.1/32) and click Add button To delete entered IP, click x button next to the entered IP
   Maintenance Window	Optional	DB maintenance window If Use is selected, set day of week, start time, duration For stable DB management, set maintenance window is recommended. Patching is performed at the set time and service interruption occurs If set to Not Used, problems caused by not applying patching are not the responsibility of the company.
   Tag	Optional	Add tag Click Add Tag button and enter or select Key, Value values

   Table. MariaDB(DBaaS) Replica Configuration Items

Reconfiguring Replica

In case of network failure or Replication delay with Master Cluster, you can replicate Master Cluster’s data again through Replica reconfiguration functionality.

Follow these steps to reconfigure Replica.

1. Click All Services > Database > MariaDB(DBaaS) menu. You will be taken to MariaDB(DBaaS)’s Service Home page.
2. Click MariaDB(DBaaS) menu on the Service Home page. You will be taken to the MariaDB(DBaaS) List page.
3. Click the resource for which you want to reconfigure Replica on the MariaDB(DBaaS) List page. You will be taken to the MariaDB(DBaaS) Detail page.
4. Click Replica Reconfiguration button. Replica Reconfiguration Notification popup window will open.
5. Click Confirm button in the Replica Reconfiguration Notification popup window.

Promoting Replica Cluster to Master Cluster

You can promote a configured Replica Cluster to Master Cluster.

Follow these steps to promote Replica Cluster to Master.

1. Click All Services > Database > MariaDB(DBaaS) menu. You will be taken to MariaDB(DBaaS)’s Service Home page.
2. Click MariaDB(DBaaS) menu on the Service Home page. You will be taken to the MariaDB(DBaaS) List page.
3. Click the resource for which you want to promote to Master on the MariaDB(DBaaS) List page. You will be taken to the MariaDB(DBaaS) Detail page.
4. Click More button and click Master Promotion button. Master Promotion Notification popup window will open.
5. Click Confirm button in the Master Promotion Notification popup window.