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LVM for safely reallocating space

edited Feb 28, 2012 5:51AM in Linux Operating System (MOSC)
Hi guys.

Using RHEL 4.8 . Gnome . Applications . System Settings . Logical Volume Management (Oh for an idiot proof user guide! LVM for dummies.) can I safely reallocate extents from one Volume Group to another ?

From Data.1 to OS.1 below ?

[root@...]# df -h
Filesystem......................Size...Used...Avail...Use% Mounted on
/dev/mapper/RAID5vhd.1-OS.1......15G....12G....1.8G....88% /
...
/dev/mapper/RAID5vhd.2-Data.1...419G...236G....162G....60% /data

And / or at the command line using lvreduce and lvextend ? Guaranteeing not to loose data ?

I don't even know how to establish if I have LVM 1 or 2.

Following RedHat documentation links has not built my confidence:

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