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I've tested multiple cinder backends for Gluster && iSCSI LVM
1. http://bderzhavets.blogspot.com/2014/11/tuning-rdo-juno-centos-7-twonode.html
2.http://bderzhavets.blogspot.com/2014/11/lvmiscsi-cinder-backend-for-rdo-juno-on.html
You may have in /etc/cinder/cinder.conf following entries :- First entry id [DEFAULT] section

#######################
enabled_backends=lvm52,gluster
#######################

and at the bottom

[lvm52]
iscsi_helper=lioadm
volume_group=cinder-volumes52
volume_driver=cinder.volume.drivers.lvm.LVMISCSIDriver
iscsi_ip_address=192.168.1.127
volume_backend_name=LVM_iSCSI52
[gluster]
volume_driver = cinder.volume.drivers.glusterfs.GlusterfsDriver
glusterfs_shares_config = /etc/cinder/shares.conf
glusterfs_mount_point_base = /var/lib/cinder/volumes
volume_backend_name=GLUSTER

I've tested multiple cinder backends for Gluster && iSCSI LVM
1. http://bderzhavets.blogspot.com/2014/11/tuning-rdo-juno-centos-7-twonode.html
2.http://bderzhavets.blogspot.com/2014/11/lvmiscsi-cinder-backend-for-rdo-juno-on.html2. http://bderzhavets.blogspot.com/2014/11/lvmiscsi-cinder-backend-for-rdo-juno-on.html
You may have in /etc/cinder/cinder.conf following entries :- :-
First entry id in [DEFAULT] section

#######################
enabled_backends=lvm52,gluster
#######################

and at the bottom

[lvm52]
iscsi_helper=lioadm
volume_group=cinder-volumes52
volume_driver=cinder.volume.drivers.lvm.LVMISCSIDriver
iscsi_ip_address=192.168.1.127
volume_backend_name=LVM_iSCSI52
[gluster]
volume_driver = cinder.volume.drivers.glusterfs.GlusterfsDriver
glusterfs_shares_config = /etc/cinder/shares.conf
glusterfs_mount_point_base = /var/lib/cinder/volumes
volume_backend_name=GLUSTER