Recognize new virtual disks added to Linux VMs without reboot

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It is possible that when a new virtual disk is added to a Linux VM, the same is not visible ('fdisk -l') in the VM. To recognize new virtual disks without reboot use:

echo "- - -" > /sys/class/scsi_host/host0/scan
echo "- - -" > /sys/class/scsi_host/host1/scan
echo "- - -" > /sys/class/scsi_host/host2/scan

Refer CentOS 7.x adding or removing FC multipath disks without reboot

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