延伸群集概述Stretched clusters overview

适用于 Azure Stack HCI 版本 v20H2Applies to Azure Stack HCI, version v20H2

用于灾难恢复的 Azure Stack HCI 延伸群集解决方案提供自动故障转移以快速恢复生产,而无需手动干预。An Azure Stack HCI stretched cluster solution for disaster recovery provides automatic failover to restore production quickly, and without the need for manual intervention. 存储副本提供跨站点的卷复制以进行灾难恢复,所有服务器保持同步。Storage Replica provides the replication of volumes across sites for disaster recovery, with all servers staying in sync.

存储副本支持同步和异步复制:Storage Replica supports both synchronous and asynchronous replication:

  • 同步复制使用在故障时保持一致的卷在低延迟网络中跨站点创建数据镜像,以确保在发生故障时不会在文件系统级别上丢失任何数据。Synchronous replication mirrors data across sites in a low-latency network with crash-consistent volumes to ensure zero data loss at the file-system level during a failure.
  • 异步复制通过较高延迟网络链接映射都市范围外的站点之间的数据,但不保证在出现故障时两个站点具有完全相同的数据副本。Asynchronous replication mirrors data across sites beyond metropolitan ranges over network links with higher latencies, but without a guarantee that both sites have identical copies of the data at the time of a failure.

有两种类型的延伸群集:主动-被动和主动-主动。There are two types of stretched clusters, active-passive and active-active. 可设置主动-被动站点复制,其中有一个首选站点和复制方向。You can set up active-passive site replication, where there is a preferred site and direction for replication. 主动-主动复制是指可从任一站点进行双向复制。Active-active replication is where replication can happen bi-directionally from either site. 本文仅介绍主动/被动配置。This article covers the active/passive configuration only.

简单地说,主动站点具有资源并为客户端提供要连接的角色和工作负载。In simple terms, an active site is one that has resources and is providing roles and workloads for clients to connect to. 被动站点不为客户端提供任何角色或工作负载,并且将等待来自主动站点的故障转移以进行灾难恢复。A passive site is one that does not provide any roles or workloads for clients and is waiting for a failover from the active site for disaster recovery.

这两个站点可位于两个不同的州、不同的城市、不同的楼层或不同的房间。Sites can be in two different states, different cities, different floors, or different rooms. 使用两个站点的延伸群集在某个站点出现中断或故障时,提供灾难恢复和业务连续性。Stretched clusters using two sites provides disaster recovery and business continuity should a site suffer an outage or failure.

主动-被动延伸群集Active-passive stretched cluster

下图显示站点 1 是主动站点,复制到站点 2(单向复制)。The following diagram shows Site 1 as the active site with replication to Site 2, a unidirectional replication.

主动/被动延伸群集方案

主动-主动延伸群集Active-active stretched cluster

下图显示站点 1 和站点 2 均是主动站点,双向复制到其他站点。The following diagram shows both Site 1 and Site 2 as being active sites, with bidirectional replication to the other site.

主动/主动延伸群集方案

后续步骤Next steps