Synology SA3200D Synology High Availability SHA User Guide for DSM 7.0 - Page 18

Split-brain error simulation and solutions, split-brain, Navigate the SHA User Interface

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Chapter 3: Set Up and Configure an SHA Cluster Split-brain error simulation and solutions A split-brain error occurs when there is an interrupted connection between the Heartbeat and Cluster connections. Both the active and passive servers will try to assume the role of the active server and result in a "split-brain". This may lead to data inconsistencies on the servers and must be resolved as soon as possible. For more information on split-brain, you can refer to the Split-brain section of Chapter 4: Navigate the SHA User Interface. This section demonstrates how to test and solve the split-brain error. Since the testing process will affect the status of the cluster, we recommend you to do this when the cluster is not providing services. Enter Safe Mode (Split-brain Mode) 1. Go to Control Panel > Shared Folder to create a shared folder (Share1). Upload some test files (1.txt and 2.txt) to Share1 through File Station. 2. Quickly unplug all cables from the active server (NAS-A). Services will be temporarily unavailable. 3. The system will notice that the active server (NAS-A) is unavailable and perform autofailover to the passive server (NAS-B). The passive server (NAS-B) will become the active server and start providing services. 16

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16
Chapter 3: Set Up and Configure an SHA Cluster
Split-brain error simulation and solutions
A
split-brain
error occurs when there is an interrupted connection between the Heartbeat
and Cluster connections. Both the active and passive servers will try to assume the role of the
active server and result in a “split-brain”. This may lead to data inconsistencies on the servers
and must be resolved as soon as possible. For more information on split-brain, you can refer
to the
Split-brain
section of
Chapter 4: Navigate the SHA User Interface
.
This section demonstrates how to test and solve the split-brain error. Since the testing process
will affect the status of the cluster, we recommend you to do this when the cluster is not
providing services.
Enter Safe Mode (Split-brain Mode)
1. Go to
Control Panel
>
Shared Folder
to create a shared folder (
Share1
). Upload some test
files (
1.txt
and
2.txt
) to
Share1
through
File Station
.
2. Quickly unplug all cables from the active server (NAS-A). Services will be temporarily
unavailable.
3. The system will notice that the active server (NAS-A) is unavailable and perform auto-
failover to the passive server (NAS-B). The passive server (NAS-B) will become the active
server and start providing services.