• In order to increase the size of a logical volume, the volume group that it is in must have free space available.

• To view the free space of your volume group, run vgdisplay command as shown below and look at the “Free PE / Size” field.

• If there is free storage available we can expand the LVM using the following command

# lvextend -L<Size>G <Volume Group Path>

• If there are not much free space available in Physical Volume and Volume group.
• We can’t extend the lvm size, for extending we need to add one Physical volume (PV).
• Then we have to extend the volume group by extending the Volume group (VG).

Step 1: Add a New physical disk and create a partition:

• We will get enough space to extend the Logical volume size. So first we are going to add one physical volume.
• To add a physical volume we need to add disk additional storage to ScaleArc Instance.
• Use the following commands to Scan the new device added:

• To detect a new hard drive attached you need to first get your host bus number used using command
             # grep mpt /sys/class/scsi_host/host?/proc_name
• You should get a output like below

                 /sys/class/scsi_host/host2/proc_name:mptspi

• So as you see your host2 is the relevant fields where you need to reset the storage buffer values. Run the below command

                     # echo "- - -" > /sys/class/scsi_host/host2/scan

• Once done verify if you can see the new hard drive "/dev/sdc"

• For adding a new PV we have to use fdisk to create the LVM partition on the storage.

1. To Create new partition Press n.
2. Choose primary partition use p.
3. Choose which number of partition to be selected to create the primary partition.
4. Press 1 if no other partition is created on the disk.
5. Change the type using t.
6. Type 8e to change the partition type to Linux LVM.
7. Use p to print the create partition
8. Press w to write the changes.

• Verify if the new partition is visible by "fdisk /dev/sdc"

• If the partition is not visible in "/dev/" run the command partprobe to make the computer rescan the disk for partitions.

• If the device is still not listed, reboot the instance. (Rarely Needed)

• Now the device can be seen listed under /dev/ add the partition to the Volume group

$ vgextend scalearc /dev/sdc2

•   Verify if the device is displayed under Volume group

# vgs

• Extended the Logical Volume "data" (No need to unmount the /data volume)

$ lvextend /dev/scalearc/data  /dev/sdc2

• Verify if the Volume is extended

$ lvs

• Resize the File System on LVM "lv_data"

$ resize2fs /dev/vg_data/lv_data

• Make sure the /data is expanded.

$ df -ah