LinuxQuestions.org - [SOLVED] File System Fun

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I'm using CentOS 6.3 trying to figure somethings out that I'm having a hard time with. Looking for help here.
I want to know how to take

Code:

[root@CentOSLabGUI /]# df

Filesystem          1K-blocks      Used Available Use% Mounted on

/dev/mapper/vg_centoslabgui-lv_root

                      18618236  2344436  15328036  14% /

tmpfs                  905352      444    904908  1% /dev/shm

/dev/sda1              495844    52532    417712  12% /boot

[root@CentOSLabGUI /]#

the vg /dev/mapper/vg_centoslabgui-lv_root
and resize it to allow me to add another pv and so on. I know how to do all this from a clean harddrive. Also I'm trying to learn how to do this in the terminal no GUI. If you need anymore info let me know. Thanks guys

haha found a solution to the question right here on these forums
i used this

Code:

Shrinking volume from 10G to 9G:



While online enlarging is no problem, you have to umount for shrinking!

Code:

# umount /dev/vg_blah/lv_blah

Perform a check of the filesystem...

Code:

# e2fsck -f /dev/vg_blah/lv_blah

Resize the filesystem first.

Code:

# resize2fs /dev/vg_blah/lv_blah 9G

Then reduce the size of the logical volume.

Code:

# lvreduce -L -1G /dev/vg_blah/lv_blah