Help Center/ Elastic Cloud Server/ Drawer/ Purchasing an ECS/ Advanced Settings/ ECS Group
Updated on 2025-10-30 GMT+08:00
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ECS Group

Description

  • ECS group

    An ECS group logically groups ECSs. The ECSs in an ECS group comply with the same policy associated with the ECS group.

    An ECS group allows you to create ECSs on different physical servers to improve service reliability.

  • Anti-affinity

    You can use an anti-affinity policy to deploy ECSs in the same group on different physical servers to ensure high service availability and underlying DR capabilities.

  • Adding an ECS to an ECS group
    • You can add an ECS to an ECS group when creating one.
    • You can also add an ECS to an ECS group after the ECS is created.

      ECSs that have local disks attached can be added to an ECS group only during the creation process. Once created, they can no longer be added to any ECS group.

    For more restrictions, see Managing ECS Groups.

FAQs

How Can I Check Whether the ECSs Attached with the Same Shared SCSI Disk Are in the Same ECS Group?

Shared EVS disks of the SCSI type support SCSI locks. To improve data security, the shared EVS disks of the SCSI type must be attached to the ECSs in the same anti-affinity ECS group. You can check whether the ECSs attached with the same shared SCSI disk are in the same ECS group on the console.

For details, see How Can I Check Whether the ECSs Attached with the Same Shared SCSI Disk Are in the Same ECS Group?

Parent Topic: Advanced Settings