Parameter Description
Replication Mode Data replication mode of the consistency
group. The values include:
l Synchronous: When data is written on a
primary resource, the write request is
also sent to the secondary resource. Only
after the data is written on both the
primary and secondary resources
successfully, does the host receive a
successful data write message.
Synchronous mode ensures that the data
on the primary resource and secondary
resource synchronizes in real-time.
l Asynchronous: When data is written on
a primary resource successfully, the host
receives a successful data write message.
In the meanwhile, the primary site
records the data difference between the
written data and the secondary resource.
In the data synchronization later, only
the different data the primary site
records are synchronized to the
secondary site, reducing the write
latency of application server to the
minimum.
Role
The local resource of the remote replication
pair in the consistency group is the primary
resource or not. If the local resource is the
primary resource, it displays as Primary.
Otherwise, it displays as Secondary.
Recovery Policy After the remote replication internal I/O
error is rectified or the replication link is up,
the consistency group automatically
synchronizes data or not. The values
include:
l Manual: The consistency group enters
the To be recovered state. You need to
manually synchronize the data from the
primary resource to the secondary
resource.
l Automatic: The consistency group
enters the Synchronizing state. The
system will automatically synchronize
the data from the primary resource to the
secondary resource.
OceanStor V3 Series
Remote Replication Feature Guide for Block
7 Managing Consistency Groups
Issue 06 (2018-01-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
125
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