f1bfd9790d
This patch adds the ability to create multiple attachments
for a single volume. This change requires that a volume
either be created with a special volume-type that includes
extra-specs indicating the requirement for multiattach
capabilities from the backend:
`extra_specs: {'multiattach': '<is> True'}`
or that an available volume is retyped to the specified
multiattach type.
What the patch does is pretty simple:
1. On volume create
Inspect the associated volume-type to see if it includes
the multiattach capability, if it does and
scheduling/creation is succesful; then we set the
multiattach attribute on the volume to True
2. On volume retype
We verify that if the retype involves multiattach
capability that it's allowed and check policy.
After retype, again we set/update the multiattach
attribute of the volume appropriately to match
the newly specified type.
Note that we do NOT do anything to enforce the volume is
formatted with a shared filesystem! Attempting to use
this feature with a standard ext4 filesystem will lead to
one or more of your attachments erroring out and being
converted to read only mode.
blueprint: bp/multi-attach-v3-attach
Change-Id: Ic8a8ba2271d6ed672b694d3991dabd46bd9a69f4
2.0 KiB
Cinder Administration
The OpenStack Block Storage service works through the interaction of
a series of daemon processes named cinder-* that reside
persistently on the host machine or machines. You can run all the
binaries from a single node, or spread across multiple nodes. You can
also run them on the same node as other OpenStack services.
To administer the OpenStack Block Storage service, it is helpful to understand a number of concepts. You must make certain choices when you configure the Block Storage service in OpenStack. The bulk of the options come down to two choices - single node or multi-node install. You can read a longer discussion about Storage Decisions in the OpenStack Operations Guide.
OpenStack Block Storage enables you to add extra block-level storage to your OpenStack Compute instances. This service is similar to the Amazon EC2 Elastic Block Storage (EBS) offering.
blockstorage-api-throughput.rst blockstorage-manage-volumes.rst blockstorage-troubleshoot.rst generalized_filters.rst blockstorage-backup-disks.rst blockstorage-boot-from-volume.rst blockstorage-consistency-groups.rst blockstorage-driver-filter-weighing.rst blockstorage-get-capabilities.rst blockstorage-groups.rst blockstorage-image-volume-cache.rst blockstorage-lio-iscsi-support.rst blockstorage-multi-backend.rst blockstorage-nfs-backend.rst blockstorage-over-subscription.rst blockstorage-ratelimit-volume-copy-bandwidth.rst blockstorage-volume-backed-image.rst blockstorage-volume-backups-export-import.rst blockstorage-volume-backups.rst blockstorage-volume-migration.rst blockstorage-volume-multiattach.rst blockstorage-volume-number-weigher.rst blockstorage-report-backend-state.rst