How do I grow or extend a GFS2 file-system on RHEL?

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Issue

How can I safely grow or extend a GFS2 file-system online?

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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