OceanStor 9000 V100R001C01 data balancing policy levels

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OceanStor 9000 data balancing policy levels are based on the impact of data balancing on normal services. These priority levels comprise the following:
High: Data balancing causes system performance to deteriorate by no more than 50%.
Medium: Data balancing causes system performance to deteriorate by no more than 30%.
Low: Data balancing causes system performance to deteriorate by no more than 10% (by default).
When a data recovery task and a data balancing task are both initiated, the former is performed prior to the latter.

Other related questions:
Configuring OceanStor 9000 V100R001C01 data balancing policies
OceanStor 9000 V100R001C01 data balancing polices are configured as follows: 1. Log in to OceanStor DeviceManager. 2. Choose Settings > Cluster Settings > Protection Policy > Data Balancing Policy. 3. Set Balancing Mode. 4. Set Balancing Policy. 5. Click Save. In the Execution Result dialog box, click Close after viewing the Succeed result. 6. (Optional) Click Task Management on the lower right of OceanStor DeviceManager to query the progress and other basic information of the data balancing task.

Introduction to OceanStor 9000 V100R001C01 data balancing
OceanStor 9000 data balancing refers to the balancing of data capacity on storage nodes. After a disk or node is added, you can migrate it to make data evenly distributed on all storage nodes. OceanStor 9000 provides two modes of data balancing: - Manual balancing: After a data balancing task is manually started, the system checks whether data in each node pool is balanced in the system. If data is unbalanced, the system starts a data balancing task. - Automatic balancing: After a disk or node is added, the system waits 30 minutes and then starts a data balancing task. If the waiting time is shorter than 30 minutes and more disks or nodes are added, the system waits another 30 minutes before starting a data balancing task.

Manually enabling or disabling OceanStor 9000 V100R001C01 data balancing
The procedure for manually enabling or disabling OceanStor 9000 V100R001C01 data balancing is as follows: 1. Log in to OceanStor DeviceManager. 2. Choose Settings > Cluster Settings > Protection Policy > Data Balancing Policy. 3. Check whether Data Balancing Mode is set to Manual. If yes, go to step 5. If not, go to step 4. 4. Select Manual for Data Balancing Mode and click Save. In the Execution Result dialog box, click Close after viewing the Succeed result. Then, you can select Start or Stop for Manual. 5. Select Start or Stop as needed. Carefully read the warning information in the Warning dialog box. Ensure all operations are correct, and then select I have read and understand the consequences associated with performing this operation. Click OK.

Method used to recover data on OceanStor 9000 V100R001C01
Based on failed objects and data recovery triggering conditions, OceanStor 9000 V100R001C01 recovers data using two methods: ensuring zero data loss on the original disk or node and writing the data in a failed disk or node to other normal disks or nodes through calculations.

Impact of policies for automatic data recovery on OceanStor 9000 V100R001C01
The impact of policies for automatic data recovery on OceanStor 9000 V100R001C01 defines the system performance impact of data recovery tasks within an execution period specified by data recovery policies.

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