[DRBD-user] Lower device already claimed error

[Lin Zhao]

Hi I'm setting up drbd on a Linux 2.6.18-238.el5. When I'm doing drbdadmin attach, i get error:

/dev/drbd1: Failure: (114) Lower device is already claimed. This usually means it is mounted.
Command 'drbdsetup /dev/drbd1 disk /dev/sda2 /dev/sda2 internal --set-defaults --create-device' terminated with exit code 10


sda2 should by no means be mounted:
[root at mbus5 ~]# mount -l
/dev/md1 on / type ext3 (rw,noatime)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/md0 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)


Any pointer how to resolve this issue? I also tried zero out /dev/sda2 but it won't help.

My drbd.conf:
global {
  usage-count yes;
}

common {
  protocol C;
  syncer {
    rate 40M;
  }
}

resource r0 {

  on mbus5 {
    device    /dev/drbd1;
    disk      /dev/sda2;
    address   10.20.40.100:7789;
    meta-disk internal;
  }
  on mbus6 {
    device    /dev/drbd1;
    disk      /dev/sda2;
    address   10.20.40.81:7789;
    meta-disk internal;
  }

}


Thanks, Lin
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