[DRBD-user] Split brain problem.

Ivan Pavlenko i.pavlenko at unsw.edu.au
Fri Dec 2 01:30:37 CET 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Could you help me to fix a problem with split brain, please?

I have Red Hat cluster based on RHEL 5.7 and provide nfs-over-gfs2 
service. I use DRBD as a storage.

# cat /etc/drbd.conf
# please have a a look at the example configuration file in
# /usr/share/doc/drbd83/drbd.conf
include "/etc/drbd.d/global_common.conf";
include "/etc/drbd.d/r0.res";

# cat /etc/drbd.d/r0.res
resource r0 {
   on infplsm017 {
     device    /dev/drbd1;
     disk      /dev/sdb1;
     meta-disk internal;
   on infplsm018 {
     device    /dev/drbd1;
     disk      /dev/sdb1;
     meta-disk internal;

As you can see, there is nothing sophisticated here.

I have:

# cat /proc/drbd
version: 8.3.8 (api:88/proto:86-94)
GIT-hash: d78846e52224fd00562f7c225bcc25b2d422321d build by 
mockbuild at builder10.centos.org, 2010-06-04 08:04:09

  1: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown   r----
     ns:0 nr:0 dw:0 dr:332 al:0 bm:4 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b 

# ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=64 time=2.99 ms
64 bytes from icmp_seq=2 ttl=64 time=13.9 ms

But when I try to use telnet for port 7789 I get:

# telnet 7789
telnet: connect to address Connection refused
telnet: Unable to connect to remote host: Connection refused  only

But at the same time:

# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

I did it from my first server (INFPLSM017). And I have absolutely same 
result from the second one (INFPLSM018). Could you tell me, please, wht 
the possible reason of this problem and how I can fix this.

Thank you in advance,

More information about the drbd-user mailing list