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    Elastic Compute Service:Migrate disks in a dedicated block storage cluster

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    Elastic Compute Service:Migrate disks in a dedicated block storage cluster

    Last Updated:Sep 07, 2026

    Migrate disks into, out of, or between dedicated block storage clusters to isolate storage or retain disks before cluster expiration.

    Prerequisites

    • The dedicated block storage cluster is not in the expired state.

    • The disk uses pay-as-you-go billing. To migrate a subscription disk, change its billing method first.

    • The disk is in the In Use (In_use) or Unattached (Available) state.

    • If the disk is attached to an ECS instance, the instance is in the Running (Running) or Stopped (Stopped) state, not in the Expired (Expired) state, and has no overdue payment.

    • A snapshot is created to back up disk data.

    Usage notes

    • Disk performance may degrade during migration. Avoid peak business hours. See Block storage performance.

    • Migration may fail due to insufficient resources.

    Limitations

    Migration phase

    Constraint

    Before migration

    A disk must meet all the following conditions. Otherwise, migration fails.

    • The disk and the destination cluster are in the same zone.

    • The disk specifications match those supported by the destination cluster. For cross-cluster migration, you can change disk specifications to match the destination.

    • A maximum of five concurrent migration tasks per Alibaba Cloud account per region.

    • Disks attached to an ECS instance that is part of a migration plan cannot be migrated.

    During migration

    The following operations are not supported during migration:

    • Cancel migration tasks.

    • Create snapshots.

    • Upgrade or downgrade disks.

    • Scale out disks.

    • Format partitions.

    • Re-initialize disks.

    • Roll back disks from snapshots.

    • Attach or detach disks.

    • Modify the performance level (PL) of an ESSD.

    • Change the operating system on a system disk.

    Billing

    After migration, the disk billing method changes based on the scenario. See Billing for disk migration.

    Procedure

    1. Go to the Dedicated Block Storage Cluster page.

      1. Log on to the Elastic Block Storage console.

      2. In the navigation pane, choose Enterprise-level Features > Dedicated Block Storage Clusters.

    2. In the upper-left corner of the page, select a region and resource group.

    3. Find the target cluster and click its cluster ID.

    4. On the cluster details page, click the Disk Management tab, and then click Migrate In or Migrate Out.

      • Migrate In: Migrate disks from the public cloud or other clusters to this cluster.

      • Migrate Out: Migrate disks from this cluster to the public cloud or other clusters.

    5. Select the disks to migrate and click OK.

      Migration may take several hours, depending on throughput, storage size, and disk category.

    6. Check the migration progress in one of the following ways:

      • On the Disk Management tab, verify the disk status is Migrating.

      • Go to the Tasks page in the ECS console.

      • Call the DescribeTaskAttribute API operation.