Table 1-4 Running status of a remote replication pair
Running Status Description
Normal Data synchronization between the primary and secondary LUNs is
complete.
NOTE
If Initial Synchronization is set to The data on primary and secondary
resources is consistent and data synchronization is not required., a newly
created remote replication pair is in the Normal state.
Split Data replication between the primary and secondary LUNs is
suspended. The running status of a pair changes to Split after the
primary and secondary LUNs are manually split by an administrator.
Interrupted The running status of a pair changes to Interrupted after the pair
between the primary and secondary LUNs is interrupted. This occurs
when the links used by a remote replication task are down or either
LUN fails.
To be recovered If a remote replication task requires restoration using a Manual
policy following recovery from the Interrupted state, the pair
running status changes to To be recovered. This state is a notice to
begin manual synchronization to restore the pair between the original
primary and secondary LUNs.
Invalid If the original properties of a primary or secondary LUN change
while a pair is Interrupted, the pair running status changes to
Invalid because the primary and secondary system configurations
become inconsistent.
Synchronizing Data is being copied from the primary to the secondary LUN. In this
state, data on the secondary LUN is unavailable and cannot be used
for service recovery if a disaster occurs. Only Consistent LUNs can
be used to recover services.
Consistency Group
A consistency group is a collection of pairs that have a service relationship with each other.
For example, the primary storage system has three primary LUNs, which respectively store
service data, log, 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. For these LUNs, you
can create a consistency group, and add the remote replication sessions of the LUNs to the
consistency group.
Synchronization
Synchronization is a process of copying data from the primary to a secondary LUN.
Synchronization can be performed for a single remote replication session or for multiple
remote replication sessions in a consistency group at the same time.
Synchronization of a remote replication pair involves initial synchronization and incremental
synchronization.
OceanStor V3 Series
Remote Replication Feature Guide for Block
1 Feature Description
Issue 06 (2018-01-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
6
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