Method used to recover data on OceanStor 9000 V100R001C01

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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.

Other related questions:
OceanStor 9000 V100R001C01 data recovery for a failed disk
OceanStor 9000 V100R001C01 recovers data for a failed disk using the following methods: 1. If the disk has been offline for at most 10 minutes and has turned offline for no more than four times within 10 minutes, OceanStor 9000 V100R001C01 updates data changes within the offline duration to a normal disk and ensures zero loss of original data on the failed disk. 2. If the disk has been offline for over 10 minutes or has returned offline for five times within 10 minutes, or the failed disk cannot be restored and cannot go online again, OceanStor 9000 V100R001C01 obtains the data on the failed disk through calculations and writes the data to other normal disks.

OceanStor 9000 V100R001C01 data recovery for a failed node
OceanStor 9000 V100R001C01 recovers data for a failed node using the following methods: 1. If the failed node turns normal, OceanStor 9000 V100R001C01 recovers data changes within the offline duration to a normal node and ensures zero loss of original data on the failed node. 2. If the offline node requires an operation by the administrator, OceanStor 9000 V100R001C01 obtains the data on the failed node through calculations and writes the data to disks of other normal nodes.

Method used to create policies for automatic data recovery using OceanStor 9000 V100R001C01
OceanStor 9000 V100R001C01 creates policies for automatic data recovery based on the following procedures: 1. Log in to OceanStor DeviceManager. 2. Choose Settings > Cluster Settings > Protection Policy > Automatic Data Reconstruction. 3. In the function pane, click Create. 4. In the Create Data Reconstruction Policy dialog box, select Execution Period and Impact, and click OK. - Execution Period defines the time segment during which the data recovery task is executed on the specified day every week. The periods specified in data recovery policies cannot overlap. - Impact indicates the level of the impact of data recovery tasks on system performance during the time segment specified by Execution Period. The level includes High, Medium, Low, Stop, and Full Speed. In the Succeeded dialog box, click OK. The page for configuring the data recovery policy is displayed.

Principles of quick data recovery using OceanStor 9000 V100R001C01
Based on the load balancing policy and data protection levels, OceanStor 9000 divides storage resources into multiple logical groups, and each disk may belong to multiple logical groups. A logical group is an independent unit for data protection and recovery. A data protection level is assigned to each logical group (for example, 4+2). If a disk failure triggers data recovery, all logical groups to which the failed disk belongs will take part in data recovery concurrently. Therefore, the recovery speed is faster than that of a traditional RAID group. If a node failure triggers data recovery, logical groups to which all disks of the failed node belong will take part in data recovery concurrently. The maximum recovery speed is 1 TB/hour.

Manually starting data recovery using OceanStor 9000 V100R001C01
OceanStor 9000 V100R001C01 creates policies for automatic data recovery based on the following procedures: 1. Log in to OceanStor DeviceManager. 2. Choose Settings > Cluster Settings > Protection Policy > Automatic Data Reconstruction. 3. In the function pane, click Create. 4. In the Create Data Reconstruction Policy dialog box, select Execution Period and Impact, and click OK. - Execution Period defines the time segment during which the data recovery task is executed on the specified day every week. The periods specified in data recovery policies cannot overlap. - Impact indicates the level of the impact of data recovery tasks on system performance during the time segment specified by Execution Period. The level includes High, Medium, Low, Stop, and Full Speed. In the Succeeded dialog box, click OK. The page for configuring the data recovery policy is displayed.

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