76 lines
3.0 KiB
ReStructuredText
76 lines
3.0 KiB
ReStructuredText
==============
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Manage volumes
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==============
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The default OpenStack Block Storage service implementation is an
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iSCSI solution that uses :term:`Logical Volume Manager (LVM)` for Linux.
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.. note::
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The OpenStack Block Storage service is not a shared storage
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solution like a Network Attached Storage (NAS) of NFS volumes
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where you can attach a volume to multiple servers. With the
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OpenStack Block Storage service, you can attach a volume to only
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one instance at a time.
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The OpenStack Block Storage service also provides drivers that
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enable you to use several vendors' back-end storage devices in
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addition to the base LVM implementation. These storage devices can
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also be used instead of the base LVM installation.
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This high-level procedure shows you how to create and attach a volume
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to a server instance.
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**To create and attach a volume to an instance**
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#. Configure the OpenStack Compute and the OpenStack Block Storage
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services through the ``/etc/cinder/cinder.conf`` file.
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#. Use the :command:`openstack volume create ` command to create a volume.
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This command creates an LV into the volume group (VG) ``cinder-volumes``.
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#. Use the :command:`openstack server add volume` command to attach the
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volume to an instance. This command creates a unique :term:`IQN` that is
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exposed to the compute node.
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* The compute node, which runs the instance, now has an active
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iSCSI session and new local storage (usually a ``/dev/sdX``
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disk).
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* Libvirt uses that local storage as storage for the instance. The
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instance gets a new disk (usually a ``/dev/vdX`` disk).
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For this particular walkthrough, one cloud controller runs
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``nova-api``, ``nova-scheduler``, ``nova-objectstore``,
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``nova-network`` and ``cinder-*`` services. Two additional compute
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nodes run ``nova-compute``. The walkthrough uses a custom
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partitioning scheme that carves out 60 GB of space and labels it as
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LVM. The network uses the ``FlatManager`` and ``NetworkManager``
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settings for OpenStack Compute.
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The network mode does not interfere with OpenStack Block Storage
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operations, but you must set up networking for Block Storage to work.
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For details, see :ref:`networking`.
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To set up Compute to use volumes, ensure that Block Storage is
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installed along with ``lvm2``. This guide describes how to
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troubleshoot your installation and back up your Compute volumes.
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.. toctree::
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blockstorage-boot-from-volume.rst
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blockstorage-nfs-backend.rst
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blockstorage-glusterfs-backend.rst
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blockstorage-multi-backend.rst
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blockstorage-backup-disks.rst
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blockstorage-volume-migration.rst
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blockstorage-glusterfs-removal.rst
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blockstorage-volume-backups.rst
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blockstorage-volume-backups-export-import.rst
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blockstorage-lio-iscsi-support.rst
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blockstorage-volume-number-weigher.rst
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blockstorage-consistency-groups.rst
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blockstorage-driver-filter-weighing.rst
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blockstorage-ratelimit-volume-copy-bandwidth.rst
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blockstorage-over-subscription.rst
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blockstorage-image-volume-cache.rst
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blockstorage-volume-backed-image.rst
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blockstorage-get-capabilities.rst
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