Chapitre 12. Troubleshooting LVM

Procédure

• Use the following methods to gather different kinds of diagnostic data:

  • Add the -v argument to any LVM command to increase the verbosity level of the command output. Verbosity can be further increased by adding additional v’s. A maximum of four such v’s is allowed, for example, -vvvv.
  • In the log section of the /etc/lvm/lvm.conf configuration file, increase the value of the level option. This causes LVM to provide more details in the system log.

  • If the problem is related to the logical volume activation, enable LVM to log messages during the activation:

    1. Set the activation = 1 option in the log section of the /etc/lvm/lvm.conf configuration file.
    2. Execute the LVM command with the -vvvv option.
    3. Examine the command output.

    4. Reset the activation option to 0.

       If you do not reset the option to 0, the system might become unresponsive during low memory situations.

  • Display an information dump for diagnostic purposes:

    # lvmdump

  • Display additional system information:

    # lvs -v

    # pvs --all

    # dmsetup info --columns

  • Examine the last backup of the LVM metadata in the /etc/lvm/backup/ directory and archived versions in the /etc/lvm/archive/ directory.

  • Check the current configuration information:

    # lvmconfig

  • Check the /run/lvm/hints cache file for a record of which devices have physical volumes on them.