How to upgrade from RHEL 5 with a gfs or gfs2 filesystem to RHEL6 or RHEL 7? - Red Hat Customer Portal

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Issue

We have a RHEL 5 based cluster with a GFS filesystem and we want to upgrade to RHEL 6/RHEL 7 and use GFS2. How do we do that?
Can we use data from a GFS filesystem on a RHEL 5 cluster on a new RHEL 6/RHEL 7 cluster?
Can a GFS2 filesystem from a RHEL 5 cluster be used on a RHEL 6/RHEL 7 cluster?

Environment

Red Hat Enterprise Linux Server 5 (with the Clustering and Cluster-Storage)
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)
A Global Filesystem (GFS) or a Global Filesystem 2(GFS2)

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