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
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
lvm_conf_file = /etc/cinder/lvm.conf |
(String) LVM conf file to use for the LVM driver in Cinder; this setting is ignored if the specified file does not exist (You can also specify ‘None’ to not use a conf file even if one exists). |
lvm_max_over_subscription_ratio = 1.0 |
(Floating point) max_over_subscription_ratio setting for the LVM driver. If set, this takes precedence over the general max_over_subscription_ratio option. If None, the general option is used. |
lvm_mirrors = 0 |
(Integer) If >0, create LVs with multiple mirrors. Note that this requires lvm_mirrors + 2 PVs with available space |
lvm_suppress_fd_warnings = False |
(Boolean) Suppress leaked file descriptor warnings in LVM commands. |
lvm_type = default |
(String) Type of LVM volumes to deploy; (default, thin, or auto). Auto defaults to thin if thin is supported. |
volume_group = cinder-volumes |
(String) Name for the VG that will contain exported volumes |
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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