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---
deprecations:
- |
The ``[libvirt]/sparse_logical_volumes`` configuration option is now
deprecated. Sparse logical volumes were never verified by tests in Nova
and some bugs were found without having fixes so we prefer to deprecate
that feature.
By default, the LVM image backend allocates all the disk size to a logical
volume. If you want to have the volume group having thin-provisioned
logical volumes, use Cinder with volume-backed instances.
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