Removing the LVM2 settings after uninstalling HDLM

After uninstalling HDLM in an environment where LVM2 is used, edit the /etc/lvm/lvm.conf file. In the device section of the /etc/lvm/lvm.conf file, disable the unnecessary HDLM device settings, and delete the comments that had been added to the /etc/lvm/lvm.conf file by performing the following procedures:

• CANCELING_THE_SETTINGS_FOR_LVM2=GUID-0DB67982-7AC8-46D5-92E0-C93274F78CC8=5=EN=.html#GUID-0DB67982-7AC8-46D5-92E0-C93274F78CC8

• MIGRATION_TO_A_SINGLE-PATH_BOOT_DISK_ENVIRONMENT=GUID-76C63F18-CB4D-4F6E-BDE8-DFAE533836C6=5=EN=.html#GUID-76C63F18-CB4D-4F6E-BDE8-DFAE533836C6 in REMOVING_HDLM_LEVEL1=GUID-C4EFDC2B-5FAF-446A-B9FA-B67EE4DBA3F8=2=EN=.html#GUID-C4EFDC2B-5FAF-446A-B9FA-B67EE4DBA3F8

The following shows an example of editing the /etc/lvm/lvm.conf file.

• For Red Hat Enterprise Linux 9 or Oracle Linux 9:

  Before:

  devices {
                                :
          # global_filter = [ "a/.*/" ]
          # global_filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
          global_filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ]
                                :
          # types = [ "fd", 16 ]
          # types = [ "sddlmfdrv", 16 ]
                                :
          md_component_detection = 1
          # md_component_detection=0
                                :
          allow_changes_with_duplicate_pvs = 0
          # allow_changes_with_duplicate_pvs = 1
                                :
          multipath_component_detection=1
          # multipath_component_detection=0
                                :
          use_devicesfile=1
          # use_devicesfile=0
                                :
  }

  After:

  devices {
                                :
          global_filter = [ "a/.*/" ]
                                :
          # types = [ "fd", 16 ]
                                :
          md_component_detection = 1
                                :
          allow_changes_with_duplicate_pvs = 0
                                :
          multipath_component_detection=1
                                :
          use_devicesfile=1
                                :
  }

  Delete global_filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ].

  Delete the comment out character (#) from the global_filter entry to return the definition file to the state it was in before the HDLM device configuration was enabled.

  Delete the following comments:

  • # global_filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
  • # types = [ "sddlmfdrv", 16 ]
  • # md_component_detection=0
  • # allow_changes_with_duplicate_pvs = 1
  • # multipath_component_detection=0
  • # use_devicesfile=0

• For Red Hat Enterprise Linux 8, Oracle Linux 8, Oracle Unbreakable Enterprise Kernel 8 or SUSE LINUX Enterprise Server 15 SP2 or later:

  Before:

  devices {
                                :
          # global_filter = [ "a/.*/" ]
          # global_filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
          global_filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ]
                                :
          # types = [ "fd", 16 ]
          # types = [ "sddlmfdrv", 16 ]
                                :
          md_component_detection = 1
          # md_component_detection=0
                                :
          allow_changes_with_duplicate_pvs = 0
          # allow_changes_with_duplicate_pvs = 1
                                :
  }

  After:

  devices {
                                :
          global_filter = [ "a/.*/" ]
                                :
          # types = [ "fd", 16 ]
                                :
          md_component_detection = 1
                                :
          allow_changes_with_duplicate_pvs = 0
                                :
  }

  Delete global_filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ].

  Delete the comment out character (#) from the global_filter entry to return the definition file to the state it was in before the HDLM device configuration was enabled.

  Delete the following comments:

  • # global_filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
  • # types = [ "sddlmfdrv", 16 ]
  • # md_component_detection=0
  • # allow_changes_with_duplicate_pvs = 1

• For SUSE LINUX Enterprise Server 12, SUSE LINUX Enterprise Server 15 SP1 or earlier, Red Hat Enterprise Linux 7, Oracle Linux 7 or Oracle Unbreakable Enterprise Kernel 7:

  If you want to use use_lvmetad=0 for operation, specify filter, not global_filter.

  Before:

  # This section allows you to configure which block devices should
  # be used by the LVM system.
  devices {
                                :
          # filter = [ "a/.*/" ]
          # filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
          filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ]
                                :
          write_cache_state = 1
          # write_cache_state = 0
                                :
          # types = [ "fd", 16 ]
          # types = [ "sddlmfdrv", 16 ]
                                :
          md_component_detection = 1
          # md_component_detection=0
                                :
  }

  After:

  # This section allows you to configure which block devices should
  # be used by the LVM system.
  devices {    
                                :
          filter = [ "a/.*/" ]
                                :
          write_cache_state = 1
                                :
          # types = [ "fd", 16 ]
                                :
          md_component_detection = 1
                                :
  }

  Delete filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ].

  Delete the comment out character (#) from the filter entry to return the definition file to the state it was in before the HDLM device configuration was enabled.

  Delete the following comments:

  • # filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
  • # write_cache_state = 0
  • # types = [ "sddlmfdrv", 16 ]
  • # md_component_detection=0

• For OSs other than the above:

  If you want to use use_lvmetad=1 for operation in an LVM2 version that can use global_filter, specify global_filter, not filter.

  Before:

  # This section allows you to configure which block devices should
  # be used by the LVM system.
  devices {    
                                :
          # filter = [ "a/.*/" ]
                                :
          # global_filter = [ "a/.*/" ]
          # global_filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
          global_filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ]
                                :
          write_cache_state = 1
          # write_cache_state = 0
                                :
          # types = [ "fd", 16 ]
          # types = [ "sddlmfdrv", 16 ]
                                :
          md_component_detection = 1
          # md_component_detection=0
                                :
  }

  After:

  # This section allows you to configure which block devices should
  # be used by the LVM system.
  devices {    
                                :
          # filter = [ "a/.*/" ]
                                :
          global_filter = [ "a/.*/" ]
                                :
          write_cache_state = 1
                                :
          # types = [ "fd", 16 ]
                                :
          md_component_detection = 1
                                :
  }

  Delete global_filter = [ "r|sddlm[a-p][a-p].*|", "a|/dev/sd|" ].

  Delete the comment out character (#) from the global_filter entry to return the definition file to the state it was in before the HDLM device configuration was enabled.

  Delete the following comments:

  • # global_filter = [ "a|sddlm[a-p][a-p].*|", "r|/dev/sd|" ]
  • # write_cache_state = 0
  • # types = [ "sddlmfdrv", 16 ]
  • # md_component_detection=0