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<div>Hello,</div>
<div> </div>
<div>first of all I want to say hello all recipients of the pacemaker mailinglist!</div>
<div> </div>
<div>I manage a two node active-passive cluster with an ms-drbd-resource and a depending resource.</div>
<div>Each node is located in a separate datacenter, connected by a single dwdm-connection, a second network connection is not available.</div>
<div>In case of a network interuption between the datacenters a split brain situation is created and a manual intervention of the admin is needed.</div>
<div> </div>
<div>What are your recommendations for me to avoid the split brain situation?</div>
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<div> </div>
<div> </div>
<div>Thanks in advance!</div>
<div> </div>
<div>Best regards,</div>
<div> </div>
<div>Stefan</div>
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<div> </div>
<div> </div>
<div><u>Following the configuration:</u></div>
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<div style="padding-left:35.4pt;">node lxds05 \</div>
<div style="padding-left:35.4pt;"> attributes standby="off"</div>
<div style="padding-left:35.4pt;">node lxds07 \</div>
<div style="padding-left:35.4pt;"> attributes standby="off"</div>
<div style="padding-left:35.4pt;">primitive apache2 ocf:heartbeat:apache \</div>
<div style="padding-left:35.4pt;"> params configfile="/etc/apache2/apache2.conf" httpd="/usr/sbin/apache2" \</div>
<div style="padding-left:35.4pt;"> operations $id="apache2-operations" \</div>
<div style="padding-left:35.4pt;"> op start interval="0" timeout="240" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0" timeout="240" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="15" timeout="20" start-delay="0" \</div>
<div style="padding-left:35.4pt;"> meta target-role="started" failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive omd_site_main ocf:omd:omdnagios \</div>
<div style="padding-left:35.4pt;"> params site="main" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="30s" timeout="30s" \</div>
<div style="padding-left:35.4pt;"> op start interval="0s" timeout="240s" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0s" timeout="240s" \</div>
<div style="padding-left:35.4pt;"> meta target-role="Started" failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive pri_drbd_omd ocf:linbit:drbd \</div>
<div style="padding-left:35.4pt;"> params drbd_resource="nagios" \</div>
<div style="padding-left:35.4pt;"> operations $id="drbd_disk-operations" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="10" timeout="240" \</div>
<div style="padding-left:35.4pt;"> meta failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive pri_fs_omd ocf:heartbeat:Filesystem \</div>
<div style="padding-left:35.4pt;"> params device="/dev/drbd0" directory="/opt/omd/" fstype="ext4" \</div>
<div style="padding-left:35.4pt;"> operations $id="pri_fs_omd-operations" \</div>
<div style="padding-left:35.4pt;"> op start interval="0" timeout="240" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0" timeout="360" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="15" timeout="20" start-delay="0" \</div>
<div style="padding-left:35.4pt;"> op notify interval="0" timeout="20" \</div>
<div style="padding-left:35.4pt;"> meta target-role="started" failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive pri_nagiosIP ocf:heartbeat:IPaddr2 \</div>
<div style="padding-left:35.4pt;"> params ip="192.168.12.21" cidr_netmask="24" iflabel="NagiosIP" \</div>
<div style="padding-left:35.4pt;"> operations $id="pri_nagiosIP-operations" \</div>
<div style="padding-left:35.4pt;"> op start interval="0" timeout="20" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0" timeout="20" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="10" timeout="20" start-delay="0" \</div>
<div style="padding-left:35.4pt;"> meta target-role="started" failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive res_MailTo_1 ocf:heartbeat:MailTo \</div>
<div style="padding-left:35.4pt;"> params email="stefan.senftleben@itsc.de" subject="nagios-group" \</div>
<div style="padding-left:35.4pt;"> operations $id="res_MailTo_1-operations" \</div>
<div style="padding-left:35.4pt;"> op start interval="0" timeout="10" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0" timeout="10" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="10" timeout="10" start-delay="0" \</div>
<div style="padding-left:35.4pt;"> meta failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive res_MailTo_2 ocf:heartbeat:MailTo \</div>
<div style="padding-left:35.4pt;"> params email="stefan.senftleben@itsc.de" subject="omd_site_main" \</div>
<div style="padding-left:35.4pt;"> operations $id="res_MailTo_2-operations" \</div>
<div style="padding-left:35.4pt;"> op start interval="0" timeout="10" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0" timeout="10" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="10" timeout="10" start-delay="0" \</div>
<div style="padding-left:35.4pt;"> meta failure-timeout="60"</div>
<div style="padding-left:35.4pt;">primitive res_ping_1 ocf:pacemaker:ping \</div>
<div style="padding-left:35.4pt;"> params multiplier="1000" host_list="192.168.12.1 192.168.12.2 192.168.12.13" \</div>
<div style="padding-left:35.4pt;"> operations $id="res_ping_1-operations" \</div>
<div style="padding-left:35.4pt;"> op start interval="0" timeout="60" \</div>
<div style="padding-left:35.4pt;"> op stop interval="0" timeout="20" \</div>
<div style="padding-left:35.4pt;"> op monitor interval="10" timeout="60" start-delay="0" \</div>
<div style="padding-left:35.4pt;"> op reload interval="0" timeout="100"</div>
<div style="padding-left:35.4pt;">group nagios-group pri_fs_omd pri_nagiosIP apache2 \</div>
<div style="padding-left:35.4pt;"> meta target-role="started" failure-timeout="60"</div>
<div style="padding-left:35.4pt;">ms ms_drbd_omd pri_drbd_omd \</div>
<div style="padding-left:35.4pt;"> meta clone-max="2" notify="true"</div>
<div style="padding-left:35.4pt;">clone cl_ping_1 res_ping_1 \</div>
<div style="padding-left:35.4pt;"> meta clone-max="2" notify="true"</div>
<div style="padding-left:35.4pt;">location loc_drbdmaster_ping ms_drbd_omd \</div>
<div style="padding-left:35.4pt;"> rule $id="loc_drbdmaster_ping-rule" $role="Master" pingd: defined pingd</div>
<div style="padding-left:35.4pt;">colocation col_omd_follows_drbd inf: nagios-group ms_drbd_omd:Master</div>
<div style="padding-left:35.4pt;">colocation col_omd_site_main_nagios-group inf: omd_site_main nagios-group</div>
<div style="padding-left:35.4pt;">colocation col_res_MailTo_1_nagios-group inf: res_MailTo_1 nagios-group</div>
<div style="padding-left:35.4pt;">colocation col_res_MailTo_2_omd_site_main inf: res_MailTo_2 omd_site_main</div>
<div style="padding-left:35.4pt;">order ord_drbd_before_omd inf: ms_drbd_omd:promote nagios-group:start</div>
<div style="padding-left:35.4pt;">order ord_nagios-group_omd_site_main inf: nagios-group omd_site_main</div>
<div style="padding-left:35.4pt;">order ord_nagios-group_res_MailTo_1 inf: nagios-group res_MailTo_1</div>
<div style="padding-left:35.4pt;">order ord_omd_site_main_res_MailTo_2 inf: omd_site_main res_MailTo_2</div>
<div style="padding-left:35.4pt;">property $id="cib-bootstrap-options" \</div>
<div style="padding-left:35.4pt;"> expected-quorum-votes="2" \</div>
<div style="padding-left:35.4pt;"> stonith-enabled="false" \</div>
<div style="padding-left:35.4pt;"> dc-version="1.0.8-042548a451fce8400660f6031f4da6f0223dd5dd" \</div>
<div style="padding-left:35.4pt;"> no-quorum-policy="ignore" \</div>
<div style="padding-left:35.4pt;"> cluster-infrastructure="openais" \</div>
<div style="padding-left:35.4pt;"> last-lrm-refresh="1320683212"</div>
<div style="padding-left:35.4pt;">rsc_defaults $id="rsc-options" \</div>
<div style="padding-left:35.4pt;"> resource-stickiness="100"</div>
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