How do I change a clustered LVM volume group to non-clustered on Red Hat Enterprise Linux?
Issue
- 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?
Environment
- 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,
vgswill 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 -cywas 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.
-
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