What is quorum & possible scenario of split brain in Red Hat Gluster Storage ?

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Issue

What is quorum & possible scenario of split brain in Red Hat Gluster Storage ?
is it normal to have split-brain count during 1 node down where there are total 2 nodes?
What is split-brain ?
What is client-side quorum ?
What is server-side quorum ?

Environment

Red Hat Gluster Storage 3.X

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