[CentOS] DRBD Problem

Sat Jun 24 10:44:48 UTC 2006
Johnny Hughes <mailing-lists at hughesjr.com>

On Sat, 2006-06-24 at 11:34 +0100, centos at bathnetworks.com wrote:
> > On Sat, 2006-06-24 at 07:02 +0100, centos at bathnetworks.com wrote:
> >> Hi all,
> >>
> >> I've been wrestling with a problem with drdb and centos. I have
> >> successfully created one drbd resource, but when I try the create a 2nd,
> >> I
> >> get an error on one of the nodes:
> >>
> >> Lower device is already mounted.
> >> Command 'drbdsetup /dev/drbd1 disk /dev/hdd1 internal -1' terminated
> >> with
> >> exit code 20
> >>
> >> The partition is not mounted from fstab etc and is newly created with
> >> parted after wiping this disk with dd.
> >>
> >> On the node with the problem I see:
> >>
> >> cat /proc/partitions
> >> major minor  #blocks  name
> >>
> >>    3     0   60034968 hda
> >>    3     1     514048 hda1
> >>    3     2    1534207 hda2
> >>    3     3   57986617 hda3
> >>   22     0  120060864 hdc
> >>   22     1  114688003 hdc1
> >>   22    64  117220824 hdd
> >>   22    65  114688003 hdd1
> >>  253     0  117219800 dm-0
> >>  253     1  114688003 dm-1
> >>  147     0  114556928 drbd0
> >>
> >> On the other node the dm-0 and dm-1 do not occur. Being new to Linux, I
> >> am
> >> not sure where these come from. I have tried google, but nothing makes
> >> sense.  This maybe a red herring, but dm-1 has the same number of blocks
> >> as hdd1 which I am trying to mount so I'm guessing that this is the
> >> cause
> >> of the problem.
> >>
> >> As I have tried changing every thing I can except the mb/processor and
> >> reinstalling, I'm really stuck.
> >>
> >> HELP Please.
> >>
> >> Rob
> >>
> >>
> >>
> >
> > I am not an expert on filesystems ... but dm-0 and dm-1 look like raid 0
> > or LVM partitions as they have 253 as their Major device number.
> >
> > What does fdisk -l say for that drive (/dev/hdd).
> >
> 
> Thanks for the reply.
> 
> As far as I am aware, there is no raid or lvm setup on the machine.
> 
> disk -l for hdd gives:
> 
> Disk /dev/hdd: 120.0 GB, 120034123776 bytes
> 255 heads, 63 sectors/track, 14593 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/hdd1               1       14278   114688003+  83  Linux
> 
> Rob
> 

If you are not using raid on purpose, try removing the package dmraid
like this:

rpm -e dmraid

then rebooting
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