# Adding a LVM Cinder Volume

```shell
mkfs.ext /dev/md0
mkdir /cinder-vol
mount /dev/md0 /cinder-volumes
dd if=/dev/zero of=/cinder-vol/cinder-vol bs=1 count=0 seek=3950G
losetup /dev/loop2 /cinder-vol/cinder-vol
pvcreate /dev/loop2
vgcreate cinder-vol /dev/loop2
```

Double check your work with **pvdisplay** and **vgdisplay**:

> \[root@openstack ~\]# pvdisplay   
> \--- Physical volume ---  
>  PV Name /dev/loop2  
>  VG Name cinder-vol  
>  PV Size <3.86 TiB / not usable 4.00 MiB  
>  Allocatable yes   
>  PE Size 4.00 MiB  
>  Total PE 1011199  
>  Free PE 1011199  
>  Allocated PE 0  
>  PV UUID HwHPNB-48pG-igg4-EU7d-Rucj-vniF-lrYP22  
>   
> \[root@openstack ~\]# vgdisplay   
> \--- Volume group ---  
>  VG Name cinder-vol  
>  System ID   
>  Format lvm2  
>  Metadata Areas 1  
>  Metadata Sequence No 1  
>  VG Access read/write  
>  VG Status resizable  
>  MAX LV 0  
>  Cur LV 0  
>  Open LV 0  
>  Max PV 0  
>  Cur PV 1  
>  Act PV 1  
>  VG Size <3.86 TiB  
>  PE Size 4.00 MiB  
>  Total PE 1011199  
>  Alloc PE / Size 0 / 0   
>  Free PE / Size 1011199 / <3.86 TiB  
>  VG UUID ILuHCP-9822-V1GS-lMu7-eiRu-UD3S-9xqDwY

```shell
vim /etc/cinder/cinder.conf
```

> \[lvm\]  
> volume\_backend\_name=lvm  
> volume\_driver=cinder.volume.drivers.lvm.LVMVolumeDriver  
> iscsi\_ip\_address=192.168.2.57  
> iscsi\_helper=lioadm  
> volume\_group=cinder-vol  
> volumes\_dir=/cinder-vol/cinder-vol

```shell
systemctl restart openstack-cinder-scheduler
systemctl restart openstack-cinder-volume
```

Update /usr/lib/systemd/system/openstack-losetup.service

> ExecStart=/usr/bin/sh -c '/usr/sbin/losetup -j /cinder-vol/cinder-vol | /usr/bin/grep /cinder-vol/cinder-vol || /usr/sbin/losetup -f /cinder-vol/cinder-vol'  
>  ExecStop=/usr/bin/sh -c '/usr/sbin/losetup -j /cinder-vol/cinder-vol | /usr/bin/cut -d : -f 1 | /usr/bin/xargs /usr/sbin/losetup -d'