[CentOS] Centos 4.3 & drbd

[Johnny Hughes]

On Sun, 2006-06-11 at 20:59 +0100, centos at bathnetworks.com wrote:
> Hiya,
> 
> I'm new to Centos but learning rapidly but I have been using FreeBSD. I'm
> trying to setup a HA NFS server using 2 machines. Both machines are
> running 4.3 updated to the latest via Yum.
> 
> I did yum groupinstall drbd-heartbeat and
> yum install kernel-module-drbd-kernel-module-drbd-2.6.9-34.EL to match my
> kernel.
> 
> The problem I have is that on 1 machine drbd works fine, but when I start
> drbd on the other I get an error:
> 
> Starting DRBD resources:    [ d0 ioctl(,SET_DISK_CONFIG,) failed: Invalid
> argument
> Lower device is already mounted.
> 
> cmd /sbin/drbdsetup /dev/drbd0 disk /dev/hde1 internal -1  failed!
> 
> It is not mounted as far as I can tell - df -a only shows /dev/hda and
> fstab has no entry for /dev/hde1.
> 
> I have also tried deleting the partion with parted and recreating it. I
> have also tried using just /dev/hde.
> 
> The /etc/drbd.conf is:
> 
> resource drbd0 {
>   protocol C;
> 
>   on fs1.bathnetworks.local {
>     device      /dev/drbd0;
>     disk        /dev/hde1;
>     address     10.0.0.1:7788;
>     meta-disk internal;
>   }
> 
>   on shorty.bathnetworks.local {
>     device      /dev/drbd0;
>     disk        /dev/hdc1;
>     address     10.0.0.2:7788;
>     meta-disk internal;
>   }
> }
> 
> fs1 is the machine I am having trouble with. Any help with fixing this
> would be appreciated.
> 
> Rob
> 
> 

I think you are not understanding what drbd does.

It is network RAID1 ... you can't mount and use the DRBD device on both
machines at the same time.  It is designed so that if the first machine
fails, the second machine / partition is used instead.


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