You don't show the status of the nodes, but I imagine you have two primary nodes. There is no handler specified for two primary nodes. Did you have two primary, disconnected nodes?
It shouldn't be possible to create split brain without writing on both nodes. Dan From: drbd-user-boun...@lists.linbit.com [mailto:drbd-user-boun...@lists.linbit.com] On Behalf Of Shailesh Vaidya Sent: Wednesday, April 10, 2013 1:58 AM To: drbd-user@lists.linbit.com Subject: [DRBD-user] Not able to test Automatic split brain recovery policies Hello, I am using DRBD 8.3.8 I have configured Automatic split brain recovery policies as below in /etc/drbd.conf net { max-buffers 2048; ko-count 4; after-sb-0pri discard-zero-changes; after-sb-1pri discard-secondary; } My both machines are Virtual machines so not connected actual back-to-back connection. To reproduce split-brain, I am using below procedure, 1.On Primary disable Ethernet card from 'Virtual Machine properties' 2.Wait to Secondery to start switch over and again enable Ethernet card on Primary Log shows mw that split-brain is occurred , however its shows connection dropped. Apr 9 10:30:15 drbd1 kernel: block drbd0: uuid_compare()=100 by rule 90 Apr 9 10:30:15 drbd1 kernel: block drbd0: helper command: /sbin/drbdadm initial-split-brain minor-0 Apr 9 10:30:15 drbd1 kernel: block drbd0: helper command: /sbin/drbdadm initial-split-brain minor-0 exit code 0 (0x0) Apr 9 10:30:15 drbd1 kernel: block drbd0: Split-Brain detected but unresolved, dropping connection! Apr 9 10:30:15 drbd1 kernel: block drbd0: helper command: /sbin/drbdadm split-brain minor-0 Apr 9 10:30:15 drbd1 kernel: block drbd0: helper command: /sbin/drbdadm split-brain minor-0 exit code 0 (0x0) Apr 9 10:30:15 drbd1 kernel: block drbd0: conn( WFReportParams -> Disconnecting ) Full DRBD conf file [root@drbd1 ~]# cat /etc/drbd.conf global { usage-count no; } resource r0 { protocol C; #incon-degr-cmd "echo !DRBD! pri on incon-degr | wall ; sleep 60 ; halt -f"; on drbd1 { device /dev/drbd0; disk /dev/sda3; address 10.55.199.51:7789; meta-disk internal; } on drbd2 { device /dev/drbd0; disk /dev/sda3; address 10.55.199.52:7789; meta-disk internal; } disk { on-io-error detach; } net { max-buffers 2048; ko-count 4; after-sb-0pri discard-zero-changes; after-sb-1pri discard-secondary; } syncer { rate 25M; al-extents 257; # must be a prime number } startup { wfc-timeout 20; degr-wfc-timeout 120; # 2 minutes. } } [root@drbd1 ~]# vi /var/log/messages [root@drbd1 ~]# [root@drbd1 ~]# cat /etc/drbd.conf global { usage-count no; } resource r0 { protocol C; #incon-degr-cmd "echo !DRBD! pri on incon-degr | wall ; sleep 60 ; halt -f"; on drbd1 { device /dev/drbd0; disk /dev/sda3; address 10.55.199.51:7789; meta-disk internal; } on drbd2 { device /dev/drbd0; disk /dev/sda3; address 10.55.199.52:7789; meta-disk internal; } disk { on-io-error detach; } net { max-buffers 2048; ko-count 4; after-sb-0pri discard-zero-changes; after-sb-1pri discard-secondary; } syncer { rate 25M; al-extents 257; # must be a prime number } startup { wfc-timeout 20; degr-wfc-timeout 120; # 2 minutes. } } [root@drbd1 ~]# Is this configuration issue or my testing procedure is not proper? Regards, Shailesh Vaidya DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.
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