[DRBD-user] Problem setting up drbd 8.0

[Martin Bene]

As a longtime user of drbd versions 0.5.6 through 0.7.22 I thought I
wouldn't have much of a problem setting up 8.0 on a new cluster.

Wrong.

Mostly I think that I'm running into a lack of documentation, and thus
making stupid mistakes in setup.

Desired config: two drbd devices on software raid with internal metadata
for use inprimary/secondary config.

* Info that meta data needs to be created as a seperate step is fairly
sparse.
* startup script for gentoo is somewhat minimalistic- any special reason
the script does _not_ load the drbd  module?

So far I've created the md devices I want to run drbd on, and created
drbd meta data on the devices.

Kernel is 2.6.19

Trying to start drbd results in an error:

 * Starting DRBD ...
Failure: (115) Meta device is already mounted.
Command '/sbin/drbdsetup /dev/drbd0 disk /dev/md3 /dev/md3 flexible
--set-defaults --create-device --on-io-error=detach' terminated with
exit code 10

There is nothing obvious that's accessing/using /dev/md3 - no lvm, no dm
modules, not mounted.

Any hints what I'm doing wrong are greatly apreciated.

Thanks, Martin

Config file: 
-------------------------

global {
    usage-count yes;
}

common {
  protocol C;
  syncer {
    rate 100M;
    al-extents 257;
  }

  handlers {
    pri-on-incon-degr "echo O > /proc/sysrq-trigger ; halt -f";
    pri-lost-after-sb "echo O > /proc/sysrq-trigger ; halt -f";
    local-io-error "echo O > /proc/sysrq-trigger ; halt -f";
    outdate-peer "/usr/sbin/drbd-peer-outdater";
  }

  startup {
    wfc-timeout  300;
    degr-wfc-timeout 120;    # 2 minutes.
  }

  disk {
    on-io-error   detach;
  }

  net {
    timeout       60;    #  6 seconds  (unit = 0.1 seconds)
    connect-int   10;    # 10 seconds  (unit = 1 second)
    ping-int      10;    # 10 seconds  (unit = 1 second)
    ping-timeout   5;    # 500 ms (unit = 0.1 seconds)
    ko-count 4;
    allow-two-primaries;
    cram-hmac-alg "sha1";
    shared-secret
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
x";
    after-sb-0pri disconnect;
    after-sb-1pri disconnect;
    after-sb-2pri disconnect;
    rr-conflict disconnect;
  }
}

resource drbd0 {

  on webc-neu1 {
    device     /dev/drbd0;
    disk       /dev/md3;
    address    192.168.0.21:7788;
    flexible-meta-disk  internal;
  }

  on webc-neu2 {
    device     /dev/drbd0;
    disk       /dev/md3;
    address    192.168.0.23:7788;
    flexible-meta-disk  internal;
  }
}

resource drbd1 {
  syncer {
    after "drbd0";
  }

  on webc-neu1 {
    device     /dev/drbd1;
    disk       /dev/md4;
    address    192.168.0.21:7789;
    flexible-meta-disk  internal;
  }

  on webc-neu2 {
    device     /dev/drbd1;
    disk       /dev/md4;
    address    192.168.0.23:7789;
    flexible-meta-disk  internal;
  }
}