How do I make every node have direct access to the file system?

I read this in the Wikipedia:

"OpenSSI is designed to be used for both high performance and high
availability clusters, it is possible to create an OpenSSI cluster with no
single point of failure, for example the file system can be mirrored between
two nodes, so if one node crashes the process accessing the file will fail
over to the other node. Alternatively the cluster can be designed in such a
manner that every node has direct access to the file system."
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