step by step extend volume size in openstack

Openstack Extend Volume

Step 1:

View the current  volume groups by “pvs” command

pvs

/dev/loop0 is cinder-volumes lvm2, its 20 GB volume  

Step 2:

Increase the capacity of the volume group by creating a new partition

            cd  /var/lib/cinder

dd if=/dev/zero of=cinder-volumes1 bs=1 count=0 seek=50G

Here:

cinder-volumes = file name

50GB       = new volume size

Step 3:

File is associated to the loop device /dev/loop1

losetup /dev/loop1 cinder-volumes1

Step 4:

Create partition using fdisk

fdisk /dev/loop1

Create New Partition :

Command (m for help): n

Partition type:    

p   primary (0 primary, 0 extended, 4 free)

e   extended

Select (default p): p

Partition number (1-4, default 1): 1

First sector (2048-104857599, default 2048):     #Enter

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599):  #Enter

Change Partition type

Command (m for help): t

Press L for List OR type 8e for Linux LVM

Hex code (type L to list all codes): 8e

Check Partition

Command (m for help): p

Save partition table

Command (m for help): w

Update Partition Tables

partprobe

Step 5:

Create a physical volume

pvcreate /dev/loop1

WARNING: dos signature detected on /dev/loop1 at offset 510. Wipe it? [y/n]: y

Wiping dos signature on /dev/loop1.

Physical volume "/dev/loop1" successfully created.

Extend the volume group

vgextend cinder-volumes /dev/loop1

Volume group "cinder-volumes" successfully extended

View Updated volume groups by “pvs” command

pvs

Let’s see the available physical devices :

vgdisplay

Now enable loop1 on every boot:

           vi  /etc/rc.d/rc.local

Add below command

losetup /dev/loop1 cinder-volume1