[DRBD-user] Split brain problem.

[Ivan Pavlenko]

Hi ALL,

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;
     address   10.10.24.10:7789;
     meta-disk internal;
   }
   on infplsm018 {
     device    /dev/drbd1;
     disk      /dev/sdb1;
     address   10.10.24.11:7789;
     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 
oos:524288

# ping 10.10.24.11
PING 10.10.24.11 (10.10.24.11) 56(84) bytes of data.
64 bytes from 10.10.24.11: icmp_seq=1 ttl=64 time=2.99 ms
64 bytes from 10.10.24.11: icmp_seq=2 ttl=64 time=13.9 ms

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

# telnet 10.10.24.11 7789
Trying 10.10.24.11...
telnet: connect to address 10.10.24.11: 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,
Ivan