Simultaneously writing from multiple cluster nodes to a gfs2 filesystem - Red Hat Customer Portal

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Issue

I would like to ascertain if the behavior when simultaneously writing to correct GFS2 is correct.
What I see is that when I write in a file from the 5 nodes at exactly the same time, only two of the 5 nodes can write in the file.
I expect that all 5 nodes write in the file.
Is that normal behavior?
Is write() atomic on gfs2 files?

Environment

Red Hat Enterprise Linux Server 5 (with Clustering and Cluster Storage)
Red Hat Enterprise Linux Server 6, 7 (with the High Availability Add On and Resilient Storage Add Ons)
A Global Filesystem 2(gfs2)

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