SmartMigration achieves full replication of data from source eDevVolumes to target volumes. After the replication is complete, the target volumes completely replace the source eDevVolumes and carry their services.
Prerequisites
- A source eDevVolume is available in the storage system and is normal.
- The target volume's capacity is not smaller than the source eDevVolume's capacity, and the target volume is not mapped.
Precautions
- A volume that has been mapped to an application server cannot be configured as a target volume in any SmartMigration task.
- Clone volume, volume that has sub-volumes such as snapshots or clone volumes, and eDevVolume cannot be used as a target volume in any SmartMigration task.
- The following volumes cannot be used as a source eDevVolume or a target volume in any SmartMigration task: snapshot volume, bitmap volume, PE volume, volume that has snapshots and snapshots are being rolled back, source volume/source snapshot/target volume of a replication volume, volume that is being cold migrated, and volume for which HyperMetro and remote replication have been created.
- A volume for which SmartMigration has been created cannot be used as a source eDevVolume or target volume of another SmartMigration task.
- If a target volume has a greater capacity than a source eDevVolume, the excess capacity of the target volume will not be used. For proper use of service data, ensure that no data exists in the excess capacity or use a target volume with the same capacity as the source eDevVolume.
Procedure
- Choose Resources > Dataflow > SmartMigration.
- Click Create.
The Create SmartMigration Task page is displayed.
- Specify Object: select source eDevVolumes for data migration.
- Select one or more eDevVolumes from the Available Volumes area. They will be automatically added to the Selected Volumes area.
- Click Next.
- Configure Pair: establish pair relationships between the source eDevVolumes and target volumes and configure SmartMigration pairs.
- Choose Resources > Dataflow > SmartMigration. Two pair creation modes are supported: Manual and Automatic.
- Automatic: The system automatically creates target volumes for the source eDevVolumes to be migrated.
- In the Pair Creation area, select the Automatic mode.
- Set the properties of the target volumes. Table 1 describes related parameters.
- Manual: Manually select matching target volumes for the source eDevVolumes.
Before manually configuring a pair, manually create a target volume. The capacity of the target volume must be greater than or equal to that of the source volume.
- In the Pair Creation area, select the Manual mode.
- In the SmartMigration Pairs area, click Configure.
The Configure Pair page is displayed.
- Select a desired source eDevVolume and target volume and click Add to Pair List.
A pair relationship between the selected source eDevVolume and target volume is created and listed in the SmartMigration Pairs area.
You can click Remove to remove a pair from the pair list.
- Click OK.
- Automatic: The system automatically creates target volumes for the source eDevVolumes to be migrated.
- Set the migration properties of the SmartMigration task. Table 2 describes related parameters.
Table 2 SmartMigration migration parameters Parameter
Description
Splitting Mode
Splitting mode of a SmartMigration pair. Possible values are Automatic and Manual.
- Automatic
After data synchronization is complete, the system automatically performs splitting. After the splitting is complete, the migration is complete.
- Manual
After data synchronization is complete, you need to manually perform splitting. After the splitting is complete, the migration is complete.
Default Migration Rate
Data migration rate of a SmartMigration pair. Possible values are Low, Medium, High, Highest, and Custom.
- Low
Migration takes a relatively long period of time. This value is used when the service load is heavy.
The rate is less than or equal to 2 MB/s.
- Medium
Migration takes a relatively short period of time. This value is used when the service load is relatively heavy.
The rate is less than or equal to 15 MB/s.
- High
Migration takes a short period of time. This value is used when the service load is relatively light.
The rate is less than or equal to 60 MB/s.
- Highest
Migration takes the shortest period of time. This value is used when the service load is light.
The rate is less than or equal to 500 MB/s.
- Custom
You can set the migration rate as required. The value ranges from 1 MB/s to 1024 MB/s.
NOTE:- The migration rate is affected by the volume read and write performance and the link bandwidth.
- Higher migration rates impose greater impact on host service performance. If you choose Highest, the SmartMigration task may be interrupted due to heavy service load. You are advised to use the highest rate when the host service is not running.
- Automatic
- (Optional) In the upper right corner of the page, select Advanced and enable Specify Time to specify the migration rate in a specified period.
- The migration rate for specified time applies to only the specified period. The migration rate of other periods remains the default. This parameter takes effect only when data is being migrated during the period.
Suppose that, from 2023-03-08 to 2023-04-24, you want to migrate data at a high rate for one hour starting from 23:00 and at the default rate in other periods every day. The parameter settings are as follows:
- Date: 2023-03-08 to 2023-04-24
- Start Time: 23:00
- Duration: 1 hours 0 minutes
- Migration Rate for Specified Time: High
- For details about Migration Rate for Specified Time, see the Default Migration Rate parameter.
- The migration rate for specified time applies to only the specified period. The migration rate of other periods remains the default. This parameter takes effect only when data is being migrated during the period.
- Click Next.
- Choose Resources > Dataflow > SmartMigration. Two pair creation modes are supported: Manual and Automatic.
- Click OK.
- Confirm your operation as prompted.