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When is it necessary to rebuild the initramfs?

Solution Verified - Updated 2015-10-15T21:14:35+00:00 -

Issue

Need to determine when is it necessary or applicable to rebuild the initramfs
Some disk partition and LVM changes were made with the root filesystem, is rebuilding the initram disk required?

Environment

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5

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