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What data should I gather when access to a GFS2 filesystem appears to be hung or unresponsive on RHEL 5, RHEL 6, or RHEL 7?

Solution Unverified - Updated 2017-12-07T10:16:21+00:00 -

Issue

Processes accessing GFS2file-systems are hung in state D (uninterruptible sleep).
GFS2 is hung
Access to GFS2 hangs
Where do I find gfs2_lockcapture?

Environment

Red Hat Enterprise Linux Server 5 (with the High Availability and Resilient Storage Add Ons)
Red Hat Enterprise Linux Server 6 (with the High Availability and Resilient Storage Add Ons)
Red Hat Enterprise Linux Server 7 (with the High Availability and Resilient Storage Add Ons)
Global File System 2 (GFS2)

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