To Discover and add new disk to a linux machine without having to reboot the server (e.g when virtual disk is added to a machine online) do the below:
ls /sys/class/scsi_host
#output is host0
#new rescan the scsi bus
echo "- - -" > /sys/class/scsi_host/host0/scan
#now you can see the new disk
fdisk -l
# add the new disk to the lvm if you want
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