for eaach disk to include in a volume group, initialize it as a LVM disk:
pvcreate /dev/sdX
create a volume group with that disk:
vgcreate myvg /dev/sdX
Create a 20gb volume called “myvol” inside the “myvg” volume group:
lvcreate -L 20g -n myvol myvg
Make a filesystem in the new volume:
mkfs.ext3 /dev/mapper/myvg-myvol
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