[DRBD-user] DRBD8 on LVM2 + Xen

James Vanns james.vanns at framestore-cfc.com
Wed Jan 3 15:40:45 CET 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Yes it all works fine. I have a very similar setup.

DRBD 8.0pre6 (or rc1) in primary/primary mode
LVM2 (with RH Cluster extensions)

What is the output of /proc/drbd on both machines? Looks like they don't have a cstate of connected...


----- Original Message -----
From: Tim Stoop <tim.stoop at gmail.com>
To: drbd-user at lists.linbit.com
Sent: 03 January 2007 14:05:39 o'clock GMT Europe/London
Subject: [DRBD-user] DRBD8 on LVM2 + Xen

Hi all, 

Short: Can I use DRBD8 on a LVM LV? I'm getting an error: "Failure: (114) Lower device is already mounted." 

Long: I have the following setup: 

A Xen dom0 in which I create several LV's for usage with Xen domU's. (This is very convenient on Debian Etch with the xen-create-image utility, using the --lvm switch.) I create a seperate LV which I dedicate to the Xen domU like so: 


I don't mount this partition in the domU, but I try to connect to it with drbd8-pre5 (Etch package). The relevant part of the drbd.conf: 

on drbd1 { 
device /dev/drbd0; 
disk /dev/hdb1; 
address ; 
flexible-meta-disk internal; 

(If you need more info about the drbd config, please let me know!) 

When I try to start drbd, I get the following message: 

tim at drbd1:~$ sudo /etc/init.d/drbd start 
Starting DRBD resources: drbd: initialised. Version: 8.0pre5 (api:84/proto:83) 
drbd: SVN Revision: 2481M build by root at drbd1, 2007-01-03 10:10:53 
drbd: registered as block device major 147 
[ d0 Failure: (114) Lower device is already mounted. 
s0 n0 drbd0: conn( StandAlone -> Unconnected ) 
drbd0: receiver (re)started 
drbd0: conn( Unconnected -> WFConnection ) 
(after which the counter starts counting, since the second machine isn't online) 

What am I doing wrong here? I got this setup working with drbd0.7, but I noticed it's due to be removed from Debian, so I figured, I'd better move to drbd8. 

Any help/advice is greatly appreciated. 


James Vanns
Systems Programmer
Framestore CFC Ltd.

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