cinder支持后端多种backends共存，确实很适合用户的需求。最近我们公司自己的内部openstack平台后端有sata、ssd的glusterfs volume，研究了下cinder multi backends的配置。实际上主要就是cinder.conf了。
搭建glusterfs集群看这里：http://iceyao.blog.51cto.com/9426658/1634839
cinder.conf 配置文件如下：
[DEFAULT] enabled_backends = glusterfs1,glusterfs2 # 启用两种glusterfs volume default_volume_type = sata # 默认cinder type，待会会创建 [glusterfs1] glusterfs_shares_config=/etc/cinder/glusterfs_shares1 volume_driver=cinder.volume.drivers.glusterfs.GlusterfsDriver volume_backend_name=openstack # 待会设置cinder type key的时候用到 [glusterfs2] glusterfs_shares_config=/etc/cinder/glusterfs_shares2 volume_driver=cinder.volume.drivers.glusterfs.GlusterfsDriver volume_backend_name=ssd
[root@controller001 cinder(keystone_admin)]# cat glusterfs_shares1 gluster002.sh.99cloud.net:/openstack # sata volume路径 [root@controller001 cinder(keystone_admin)]# cat glusterfs_shares2 gluster002.sh.99cloud.net:/ssd # ssd volume路径
cinder type-create sata # cinder sata类型，这也是default_volume_type，名字要对应 cinder type-key sata set volume_backend_name=openstack #为sata类型设置key value,跟上面的cinder.conf里面的配置文件对应的 cinder type-create ssd # cinder ssd类型 cinder type-key ssd set volume_backend_name=ssd # 为ssd类型设置key value # compute节点端测试glusterfs libgfapi cat /etc/nova/nova.conf # 虚拟机挂载云硬盘(libgfapi访问glusterfs volume) [libvirt] qemu_allowed_storage_drivers = gluster # nova libgfapi配置项 qemu-img create gluster://$GLUSTER_HOST/$GLUSTER_VOLUME/p_w_picpaths 5G
参考资料：redhat openstack认证培训教材
http://blog.flaper87.org/post/nova-glusterfs-direct-access/
