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manila/install-guide/source/common/dhss-false-mode-configuration.rst

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  1. Create the LVM physical volume /dev/sdc:

    # pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created

  2. Create the LVM volume group manila-volumes:

    # vgcreate manila-volumes /dev/sdc
Volume group "manila-volumes" successfully created

    The Shared File Systems service creates logical volumes in this volume group.

  3. Only instances can access Shared File Systems service volumes. However, the underlying operating system manages the devices associated with the volumes. By default, the LVM volume scanning tool scans the /dev directory for block storage devices that contain volumes. If projects use LVM on their volumes, the scanning tool detects these volumes and attempts to cache them which can cause a variety of problems with both the underlying operating system and project volumes. You must reconfigure LVM to scan only the devices that contain the cinder-volume and manila-volumes volume groups. Edit the /etc/lvm/lvm.conf file and complete the following actions:

    • In the devices section, add a filter that accepts the /dev/sdb and /dev/sdc devices and rejects all other devices:

      devices {
...
filter = [ "a/sdb/", "a/sdc", "r/.*/"]

      Warning

      If your storage nodes use LVM on the operating system disk, you must also add the associated device to the filter. For example, if the /dev/sda device contains the operating system:

      filter = [ "a/sda/", "a/sdb/", "a/sdc", "r/.*/"]

      Similarly, if your compute nodes use LVM on the operating system disk, you must also modify the filter in the /etc/lvm/lvm.conf file on those nodes to include only the operating system disk. For example, if the /dev/sda device contains the operating system:

      filter = [ "a/sda/", "r/.*/"]

Configure components

  1. Edit the /etc/manila/manila.conf file and complete the following actions:

    • In the [DEFAULT] section, enable the LVM driver and the NFS protocol:

      [DEFAULT]
...
enabled_share_backends = lvm
enabled_share_protocols = NFS

      Note

      Back end names are arbitrary. As an example, this guide uses the name of the driver.

    • In the [lvm] section, configure the LVM driver:

      [lvm]
share_backend_name = LVM
share_driver = manila.share.drivers.lvm.LVMShareDriver
driver_handles_share_servers = False
lvm_share_volume_group = manila-volumes
lvm_share_export_ip = MANAGEMENT_INTERFACE_IP_ADDRESS

      Replace MANAGEMENT_INTERFACE_IP_ADDRESS with the IP address of the management network interface on your storage node, typically 10.0.0.41 for the first node in the example architecture shown below:

      Hardware requirements.