48 lines
1.8 KiB
ReStructuredText
48 lines
1.8 KiB
ReStructuredText
..
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Copyright 2010 United States Government as represented by the
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Administrator of the National Aeronautics and Space Administration.
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All Rights Reserved.
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Copyright 2010 Anso Labs, LLC
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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Volume Documentation
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====================
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Nova uses ata-over-ethernet (AoE) to export storage volumes from multiple storage nodes. These AoE exports are attached (using libvirt) directly to running instances.
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Nova volumes are exported over the primary system VLAN (usually VLAN 1), and not over individual VLANs.
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AoE exports are numbered according to a "shelf and blade" syntax. In order to avoid collisions, we currently perform an AoE-discover of existing exports, and then grab the next unused number. (This obviously has race condition problems, and should be replaced by allocating a shelf-id to each storage node.)
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The underlying volumes are LVM logical volumes, created on demand within a single large volume group.
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The :mod:`storage` Module
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-------------------------
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.. automodule:: nova.volume.storage
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:members:
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:undoc-members:
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:show-inheritance:
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The :mod:`storage_unittest` Module
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----------------------------------
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.. automodule:: nova.tests.storage_unittest
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:members:
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:undoc-members:
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:show-inheritance:
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