Paolo Campegiani:
> If you have an LVM backed file system, and some spare space, you could
> do a snapshot of the file system with all services stopped,

If you have an LVM backed file system, it is much easier than that.
Just add the new disk to the volume group, do a pvmove, and remove the
old disk from the volume group.  It can be done with the system
running normally, no special modes or anything.

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html-single/Logical_Volume_Manager_Administration/index.html#online_relocation

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