Huawei OceanStor 2000 V3 Series Features Manual page 12

OceanStor V3 Series
HyperMetro Feature Guide for Block
DCL
DCLs record changes in the data of storage systems.
HyperMetro Domain
A HyperMetro domain consists of the local and remote storage systems, and the quorum
server. Application servers can access data across data centers using a HyperMetro domain.
HyperMetro Pair
A HyperMetro pair indicates an active-active relationship between a local and remote LUN.
With HyperMetro configured, a local and remote LUN form a HyperMetro pair. You must
create HyperMetro pairs in a HyperMetro domain. By viewing the state of a HyperMetro pair,
you can determine whether you need to perform operation such as synchronization,
suspension, and priority switchover. After performing an operation, you can view the state of
the HyperMetro pair to determine whether the operation succeeded. Configure a HyperMetro
domain before configuring HyperMetro pairs.
HyperMetro Consistency Group
A HyperMetro consistency group is a collection of HyperMetro pairs that have a service
relationship with each other. For example, the local storage system has three local LUNs that
respectively store service data, logs, and change tracking information of a database. If data on
any of the three LUNs becomes invalid, all data on the three LUNs becomes unusable. Upon
configuration, create a consistency group and add the three HyperMetro pairs to the
consistency group.
Synchronization
Synchronization refers to the synchronization of differential data between a local LUN and a
remote LUN. Data synchronization takes place between two LUNs in a HyperMetro pair. You
can synchronize data in multiple HyperMetro pairs in a consistency group.
Pause
Pause is a state indicating the suspension of a HyperMetro pair.
Force Start
To ensure data consistency when the local and remote storage systems malfunction
simultaneously, HyperMetro stops hosts from accessing both. To quickly restore services, you
can forcibly start the local or remote storage system.
Priority Switchover
Priority switchover indicates that the preferred site takes precedence during arbitration. If the
HyperMetro replication network is down, the storage system that wins arbitration continues
providing services to hosts. After the creation of a HyperMetro pair, the local data center is by
default the preferred site and the remote data center is the non-preferred site.
Issue 05 (2018-01-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
1 Feature Description
4