Add disk and expand in a Logical Volume no reboot, but not for /root /(boot).
Tested in Linux CentOS/RedHat 5.7  /var
First add a disk in (VMWare)
 echo "- - -" > /sys/class/scsi_host/host0/scan
 fdisk -l
 fdisk /dev/sdb
 mkfs -t ext3 /dev/sdb1
Add to lvm
 pvcreate /dev/sdb1
Add to existing Volume Group
 vgextend VG_30 /dev/sdb1
Resize the Logical Volume
 lvresize -L +8GB /dev/mapper/VG_30-LV_VAR
Resize to the FS
 resize2fs -p /dev/mapper/VG_30-LV_VAR
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