Re: LVM VG Activation

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On Mon, 2006-07-10 at 13:30 -0700, Tom Spec wrote:
> Two systems using shared disks in a clustered environment.  
> 
> When both systems are up I can de-activate the VG on one system,
> activate it on the other and vice-versa.  What I'm not sure about is
> what happens if the "non-active" system reboots. Will it try to
> activate those VGs (which are currently in use by the other system?)
> Is this an issue?

Dunno; not done clusters. The "vgchange" manpage sounds promising with
its "l" and "e" options, but rc.sysinit looks worrying with
--ignorelockingfailure:

        if [ -x /sbin/lvm.static ]; then
                if /sbin/lvm.static vgscan --mknodes
--ignorelockingfailure > /dev/null 2>&1 ; then
                        action $"Setting up Logical Volume
Management:" /sbin/lvm.static vgchange -a y --ignorelockingfailure
                fi
        fi

The "vgscan" manpage looks to have something useful though:

  vgscan scans all SCSI, (E)IDE disks, multiple devices and a bunch of
  other disk devices in the system looking for LVM physical volumes and
  volume groups. Define a filter in lvm.conf(8) to restrict the scan to
  avoid a CD ROM, for example.

You could probably filter out your shared disks this way.

Paul.



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