How do I change a clustered LVM volume group to non-clustered on Red Hat Enterprise Linux?

Solution Verified - Updated -


  • How do I change a volume group to clustered or non-clustered?
  • We need to mount the Clone LUN's onto another RHEL server so that we can write the data to tape from that server. While mounting the VG's on the RHEL server, I am getting the below error:
# vgimport /dev/mapper/mpath0 
  connect() failed on local socket: Connection refused 
  WARNING: Falling back to local file-based locking. 
  Volume Groups with the clustered attribute will be inaccessible. 
  Skipping clustered volume group vgname
  • How to convert a volume group from clustered to non-clustered and vice-versa?


  • Red Hat Enterprise Linux (RHEL) including
    • Red Hat Enterprise Linux 4
    • Red Hat Enterprise Linux 5
    • Red Hat Enterprise Linux 6
  • May or may not require Red Hat High Availability Cluster
  • LVM2 volume management

    • The volume group is clustered:

      • There are 2 ways to determine; firstly using vgdisplay:
      # vgdisplay vgtest --config 'global {locking_type = 0}' | grep Clustered
        WARNING: Locking disabled. Be careful! This could corrupt your metadata.
        Clustered             yes
      • Also, vgs will display the 'c' attribute for clustered volume groups:
      # vgs --config 'global {locking_type = 0}'
        WARNING: Locking disabled. Be careful! This could corrupt your metadata.
        VG     #PV #LV #SN Attr   VSize  VFree 
        vgname   1   1   0 wz--nc 96.00M 76.00M       <----- Attr includes the 'c' flag meaning clustered.
    • It is undesirable that the volume group is clustered. Possible reasons include:

      • The volume group is being converted to non-clustered permanently.
      • The command vgchange -cy was accidentally run on the volume group or the volume group was accidentally made clusrered.
        • The cluster cannot form quorum, or clvmd cannot start and the volume group needs to be temporarily un-clustered to restore service.

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.