Linux - Extending a logical volume in a virtual machine running Red Hat or Cent OS whithout reboot

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With the step by step below you can extend your logical volume without a reboot.

First find your device
ls /sys/class/scsi_device/

Than find your disk
fdisk -l

With this information you can scan the device to detect the new size:
echo 1 > /sys/class/scsi_disk/0:0:0:0/device/rescan

echo 1 > /sys/block/sda/device/rescan

*Change 0:0:0: acoording to your scsi device and sda acoording your disk 

fdisk -l to see your new size.

Now you have to create a new partition:
fdisk -l /dev/sda   (change the disk acoording your necessity)

Than create a new primary partition:
fdisk /dev/sda
    Press p to print the partition table to identify the number of partitions. By default, there are 2: sda1 and sda2.
    Press n to create a new primary partition.
    Press p for primary.
    Press 3 for the partition number, depending on the output of the partition table print.
    Press Enter two times.
    Press t to change the system's partition ID.
    Press 3 to select the newly creation partition.
    Type 8e to change the Hex Code of the partition for Linux LVM.
    Press w to write the changes to the partition table.
 
The reboot is not needed as you can also rescan for those partitions using partprobe. Run the following to scan for the newly created partition.
partprobe -s

Extend your Logical Volume with the new partition
pvcreate /dev/sda3

Type vgdisplay to get your VG.
   --- Volume group ---
  VG Name               centos
 ...

Extend your VG:
vgextend centos /dev/sda3

Get your LV
lvs

Extend your LV
lvextend /dev/centos/root /dev/sda3

Resize your disk:
resize2fs /dev/centos/root

*If you got an error like this, it may mean your filesystem is XFS instead of standard ext2/ext3 then use:
xfs_growfs /dev/mapper/centos-root
 

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