What is Split-Brain

Mihnea · Created May 16, 2019 07:55:02

Hello!

The situation when communication loss between the cluster nodes is caused by network connection problems is called network partition, which can lead to split brain. According to Wikipedia, split brain is a computer term, based on an analogy with the medical split-brain syndrome. It can be a real horror for a system administrator to handle the consequences of a split brain.

A split brain can happen if active nodes lose all synchronization and heartbeat connections between them at the same time and are not able to communicate anymore to define the synchronization state of the partner node. Split brain indicates data or availability inconsistencies originating from the maintenance of two separate data sets with overlap in scope.

Hike · Created May 16, 2019 08:05:07

Hi, Will!

Split-Brain is also a computer term.

Split-brain is a computer term, based on an analogy with the medical Split-brain syndrome. It indicates data or availability inconsistencies originating from the maintenance of two separate data sets with overlap in scope, either because of servers in a network design, or a failure condition based on servers not communicating and synchronizing their data to each other. This last case is also commonly referred to as a network partition. ---WIKI(https://en.wikipedia.org/wiki/Split-brain_(computing))

Diagnostic

In a VMU two-node cluster, the active server is restarted due to a power outage. After services are switched to the standby server, some data is inconsistent between the active and standby servers.

For more details you can refer to:

https://forum.huawei.com/enterpr ... r/thread/446795-887

Mihnea · Created May 16, 2019 07:55:02

Hello!

The situation when communication loss between the cluster nodes is caused by network connection problems is called network partition, which can lead to split brain. According to Wikipedia, split brain is a computer term, based on an analogy with the medical split-brain syndrome. It can be a real horror for a system administrator to handle the consequences of a split brain.

A split brain can happen if active nodes lose all synchronization and heartbeat connections between them at the same time and are not able to communicate anymore to define the synchronization state of the partner node. Split brain indicates data or availability inconsistencies originating from the maintenance of two separate data sets with overlap in scope.

Hike · Created May 16, 2019 08:05:07

Hi, Will!

Split-Brain is also a computer term.

Split-brain is a computer term, based on an analogy with the medical Split-brain syndrome. It indicates data or availability inconsistencies originating from the maintenance of two separate data sets with overlap in scope, either because of servers in a network design, or a failure condition based on servers not communicating and synchronizing their data to each other. This last case is also commonly referred to as a network partition. ---WIKI(https://en.wikipedia.org/wiki/Split-brain_(computing))

Diagnostic

In a VMU two-node cluster, the active server is restarted due to a power outage. After services are switched to the standby server, some data is inconsistent between the active and standby servers.

For more details you can refer to:

https://forum.huawei.com/enterpr ... r/thread/446795-887

little_fish · Created Dec 20, 2019 08:04:40

Dear,
More references here https://forum.huawei.com/enterprise/en/brain-split/thread/589910-891

What is Split-Brain

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