Huawei OceanStor V3 Series - 7.5 Performing Primary;Secondary Switchover of a Consistency Group

7.5 Performing Primary/Secondary Switchover of a
Consistency Group
This operation enables you to switch between the primary LUNs and the secondary LUNs in a
consistency group. When the primary LUNs in a consistency group fail, you can initiate a
primary/secondary switchover to enable the secondary LUNs to become the new primary
LUNs, taking over services from the original primary LUNs to ensure service continuity.
Prerequisites
Based on Running Status of a consistency group and Secondary Resource Data Status of
the remote replication pairs added to the consistency group, determine whether a primary/
secondary switchover can be performed for the consistency group, as shown in Table 7-6.
Table 7-6 Status requirements for initiating a primary/secondary switchover for a consistency
group
Running Status of
a Consistency
Group
Secondary
Resource Data
Status of Remote
Replications
Initiating a
Primary/
Secondary
Switchover for a
Synchronous
Consistency
Group
Initiating a
Primary/
Secondary
Switchover for an
Asynchronous
Consistency
Group
Normal Synchronized √ N/A
Normal Consistent N/A ×
Normal Inconsistent N/A ×
Split Consistent √ √
Split Inconsistent × ×
Interrupted Consistent × ×
Interrupted Inconsistent × ×
To be recovered Consistent × ×
To be recovered Inconsistent × ×
Invalid Any status × ×
Synchronizing Any status × ×
√: Able to operate.
×: Unable to operate.
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.
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