Sean McGinnis c87da91757 Add config table sphinx directive

In the past we had used an openstack-manuals tool to manually generate
config option tables that would then be included into driver config
documentation.

With the move of documentation in-tree and the deprecation and removal
of that tool, we have ended up with options that are no longer being
updated when drivers change, or maintainers are left manually updating
the existing tables.

This addes a sphinx extension to use a new config-table directive to
automatically pull in config options from the source so we no longer
need to perform any manual action to pick up changes.

Change-Id: I625fb96229001c326ed2400155e2d067279a400e

2018-04-26 13:47:43 -05:00

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LVM

The default volume back end uses local volumes managed by LVM.

This driver supports different transport protocols to attach volumes, currently iSCSI and iSER.

Set the following in your cinder.conf configuration file, and use the following options to configure for iSCSI transport:

volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver
iscsi_protocol = iscsi

Use the following options to configure for the iSER transport:

volume_driver = cinder.volume.drivers.lvm.LVMVolumeDriver
iscsi_protocol = iser

cinder.volume.drivers.lvm

Caution

When extending an existing volume which has a linked snapshot, the related logical volume is deactivated. This logical volume is automatically reactivated unless auto_activation_volume_list is defined in LVM configuration file lvm.conf. See the lvm.conf file for more information.

If auto activated volumes are restricted, then include the cinder volume group into this list:

auto_activation_volume_list = [ "existingVG", "cinder-volumes" ]

This note does not apply for thinly provisioned volumes because they do not need to be deactivated.

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LVM

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