Novell LINUX ENTERPRISE 11 - HIGH AVAILABILITY, Руководство пользователя, Страница: 138 / 298

14.4.3 TCP Port 7788
If your system is unable to connect to the peer, this might be a problem with your local
firewall. By default, DRBD uses the TCP port 7788 to access the other node. Make
sure that this port is accessible on both nodes.
14.4.4 DRBD Devices Broken after Reboot
In cases when DRBD does not know which of the real devices holds the latest data, it
changes to a split brain condition. In this case, the respective DRBD subsystems come
up as secondary and do not connect to each other. In this case, the following message
is written to
/var/log/messages
:
Split-Brain detected, dropping connection!
To resolve this situation, enter the following on the node which has data to be discarded:
drbdadm secondary r0
drbdadm -- --discard-my-data connect r0
On the node which has the latest data enter the following:
drbdadm connect r0
14.5 Additional Information
The following open source resources are available for DRBD:
• The following man pages for DRBD are available in the distribution:
drbd(8)
drbddisk(8)
drbdsetup(8)
drbdadm(8)
drbd.conf(5)
• Find a commented example configuration for DRBD at /usr/share/doc/
packages/drbd/drbd.conf
128 High Availability Guide