The default OpenStack Block Storage service implementation is an iSCSI solution that uses Logical Volume Manager (LVM) for Linux.
The OpenStack Block Storage service is not a shared storage solution like a Network Attached Storage (NAS) of NFS volumes where you can attach a volume to multiple servers. With the OpenStack Block Storage service, you can attach a volume to only one instance at a time.
The OpenStack Block Storage service also provides drivers that enable you to use several vendors’ back-end storage devices in addition to the base LVM implementation. These storage devices can also be used instead of the base LVM installation.
This high-level procedure shows you how to create and attach a volume to a server instance.
To create and attach a volume to an instance
For this particular walkthrough, one cloud controller runs
cinder-* services. Two additional compute
nova-compute. The walkthrough uses a custom
partitioning scheme that carves out 60 GB of space and labels it as
LVM. The network uses the
settings for OpenStack Compute.
The network mode does not interfere with OpenStack Block Storage operations, but you must set up networking for Block Storage to work. For details, see Networking.
To set up Compute to use volumes, ensure that Block Storage is
installed along with
lvm2. This guide describes how to
troubleshoot your installation and back up your Compute volumes.