[CentOS] drbd

John R Pierce pierce at hogranch.com
Wed Oct 17 18:05:07 UTC 2007

trying to follow the ha-drbd HOWTO on the centos wiki...

I prep two identical systems with centos 5, leaving some disk space 
unassigned (they only have one scsi drive), create /dev/sda4 partitions 
on each to use for the repdata...

I install the modules, create a /etc/drbd.conf like...

[root at svfis-blade03 ~]# more /etc/drbd.conf
# please have a a look at the example configuration file in
# /usr/share/doc/drbd/drbd.conf
global { usage-count no; }
resource repdata {
  protocol C;
  startup { wfc-timeout 0; degr-wfc-timeout     120; }
  disk { on-io-error detach; } # or panic, ...
  net {  cram-hmac-alg "sha1"; shared-secret "(random secret)"; } # 
don't forget to choose a secret for auth !
  syncer { rate 10M; }
  on svfis-blade03.(my intranet domain) {
    device /dev/drbd0;
    disk /dev/sda4;
    meta-disk internal;
  on svfis-blade05.(my intranet domain) {
    device /dev/drbd0;
    disk /dev/sda4;
    meta-disk internal;

I run drbdadm create-md repdata on both systems...   I start the drdb 
daemon on both systems...  and /proc/drbd says...

[root at svfis-blade03 ~]# cat /proc/drbd
version: 8.0.4 (api:86/proto:86)
SVN Revision: 2947 build by buildsvn at c5-i386-build, 2007-09-29 06:28:57
 0: cs:Connected st:Secondary/Secondary ds:Inconsistent/Inconsistent C r---
    ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0
        resync: used:0/31 hits:0 misses:0 starving:0 dirty:0 changed:0
        act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:0

and I can't promote blade03 to primary.

[root at svfis-blade03 ~]# drbdadm primary repdata 
State change failed: (-2) Refusing to be Primary without at least one 
UpToDate disk
Command 'drbdsetup /dev/drbd0 primary' terminated with exit code 11

what am I doing wrong?!?   the howto shows the disk state as 
UpToDate/Inconsistent, which is what I'd expect.

Do I have to use a physical device (/dev/sdb in the example) instead of 
a partition?

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