[DRBD-user] Device is held open by someone

[Andrew McGill]

On Wednesday 10 September 2008 16:39:24 Richard Pijnenburg wrote:
> Dear List,
>
> I'm trying out LVM over DRBD and primarly it works.
> But when i try to force a hardware failure of the first node ( power
> off ) heartbeat want's to switch over the second storage node, so that
> goes good.
> The only bad thing is that i get the error " Device is held open by
> someone "
>
> I've stopped the iscsi ( ietd ) manualy but that didn't help.
> So i'm thinking there is something still holding it open, my best
> quess is lvm.
>
> My current setup:
>
> sdb1 -> drbd0 -> pv -> vg -> lv's
>
> Does anyone have a tought about it what it could be ?
You need to tell LVM to give it up:
  vgchange -an drbd0vgname
I hacked a vgchange resource script for this purpose (see below).  

My configuration worked 100% with heartbeat v1.  If you have a semi-working 
heartbeat v2 config to share, that would be wonderful!  I have nothing but 
forced reboots to show for my efforts with v2 :(



#!/bin/bash
#
# This script is a heartbeat resource script
#
# Make a LVM volume available
# public domain
#
###

if [ "$#" -eq 2 ]; then
  RES="$1"
  CMD="$2"
else
  RES="all"
  CMD="$1"
fi

case "$CMD" in
    start)
        /sbin/vgchange -ay $RES
        ;;
    stop)
        /sbin/vgchange -an $RES
        rc=$?
        case $rc in
        0)
                exit 0
                ;;
        *)
                echo >&2 "/sbin/vgchange -an $RES: exit code $rc, returning 0"
                exit 0
                ;;
        esac
        ;;
    status)
        lvm vgs | grep -q "^  *$RES " && exit 0
        exit 3 # LSB status "service is not running"
        ;;
    *)
        echo "Usage: vgchange [resource] {start|stop|status}"
        exit 1
        ;;
esac

exit 0