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FusionCloud 6.3.0 Solution Description 05

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What Is Volume High Availability?

What Is Volume High Availability?


The Volume High Availability (VHA) provides active-active local storage for Elastic Volume Service (EVS) disks on Elastic Cloud Servers (ECSs). The service ensures that no data is lost and services are not interrupted when a storage device is faulty.

Restrictions and Limitations

The restrictions on the VHA service are as follows:

  • VHA provides local storage-based active-active protection for all EVS disks of an ECS within an AZ. VHA does not provide active-active protection across regions or AZs.
  • VHA supports only the resource pool combination of KVM+OceanStor V3/V5 or Dorado V3+Region Type I/ Type II/ Type III. Two storage devices in a HyperMetro pair in an AZ must be of the same model and the same version.
  • VHA provides DR protection for EVSs created on the operation platform of ManageOne, but does not provide backup for EVSs on other platforms such as MANO.
  • All EVS disks associated with the ECSs in a VHA service instance must be provided by the same production storage that is configured with the local storage-based active-active DR.
  • The granularity of local storage-based active-active protection is ECS, but not volume.
  • ECSs that attach the same shared EVS disk must belong to the same VHA service instance.
  • After EVS disks are mounted to a VHA-protected ECS, you need to manually add VHA protection for these EVS disks.
  • To delete partial EVS disks in a VHA service instance to cancel the active-active protection for them, you must unmount them first. Otherwise, they cannot be deleted from the VHA service instance.
Updated: 2019-04-23

Document ID: EDOC1100026685

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