Un par de apuntes rápidos sobre LVM:

Juntar varios discos o particiones en un único volumen lógico:

pvcreate /dev/sdb /dev/sdc
vgcreate -s 16M data /dev/sdb /dev/sdc
vgdisplay
lvcreate -l 25600 -n storage data
mkfs.ext3 /dev/data/storage

Expandir en 100GB un LV y el filesystem que contiene.

lvextend -L+100G /dev/mapper/loquesea
 umount /del/putno/de/montaje
 e2fsck -f /dev/mapper/loquesea
 resize2fs /dev/mapper/loquesea
 mount -a

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