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FusionCloud 6.3.1.1 Solution Description 04

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
What Is Volume High Availability?

What Is Volume High Availability?

Definition

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.
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Updated: 2019-10-23

Document ID: EDOC1100063247

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