[root@test07 ~]# drbdadm -- --force create-md r0
md_offset 1024454656
al_offset 1024421888
bm_offset 1024389120

Found some data

 ==> This might destroy existing data! <==

Do you want to proceed?
*** confirmation forced via --force option ***
You want me to create a v08 style flexible-size internal meta data block.
There appears to be a v08 flexible-size internal meta data block
already in place on /dev/sda3 at byte offset 1024454656
Do you really want to overwrite the existing v08 meta-data?
*** confirmation forced via --force option ***
Writing meta data...
initializing activity log
NOT initializing bitmap
New drbd meta data block successfully created.
[root@test07 ~]# modprobe drbd
[root@test07 ~]# drbdadm up r0
r0: Failure: (126) UnknownMandatoryTag
additional info from kernel:
required attribute missing
Command 'drbdsetup connect r0 ipv4:192.168.98.107:7789 ipv4:192.168.98.108:7789' terminated with exit code 10
[root@test07 ~]# cat /proc/drbd
version: 8.4.0 (api:1/proto:86-100)
GIT-hash: 28753f559ab51b549d16bcf487fe625d5919c49c build by build@buildvm-84c91997-2ba9-4d88-98e1-9e12780a0946, 2011-09-08 13:48:13

 1: cs:StandAlone ro:Secondary/Unknown ds:Inconsistent/DUnknown   r----s
    ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:1000380
[root@test07 ~]#


resource r0 {
  device    /dev/drbd1;
  disk      /dev/sda3;
  meta-disk internal;
  on test07.sm.scalecomputing.com {
    address   192.168.98.107:7789;
  }
  on test08.sm.scalecomputing.com {
    address   192.168.98.108:7789;
  }
}