Question: lvm how to add disk?
Answer: Add new physical disk. Boot. # pvscan. This will show you the current physical volumes. # fdisk /dev/sdb. Add the disk to your machine as a primary partition. ...  # pvcreate /dev/sdb1. This creates a new physical LVM volume on our new disk. # vgextend VolGroup00 /dev/sdb1. ...  # pvscan. ...  # lvextend -L+40G /dev/VolGroup00/LogVol00.