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One of the interesting features in RHEL 7 is the fact that it supports online disk re-sizing even if there is an active partitioning table on the disk. This feature is interesting in case you want to re-size your virtual disk. You can do this online for example in VMWare. If you have a LVM partition on the disk you want to resize then you need to perform the steps described in this article from Red Hat.
In order to resize online a partition which is in use please observe the following steps: