
<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">

<meta name="Generator" content="Microsoft Exchange Server">

<!-- converted from rtf -->

<style><!-- .EmailQuote { margin-left: 1pt; padding-left: 4pt; border-left: #800000 2px solid; } --></style>

</head>

<body>

<font face="Calibri" size="2"><span style="font-size:11pt;">

<div>Hello,</div>

<div>&nbsp;</div>

<div>first of all I want to say hello all recipients of the pacemaker mailinglist!</div>

<div>&nbsp;</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>&nbsp;</div>

<div>What are your recommendations for me to avoid the split brain situation?</div>

<div>&nbsp;</div>

<div>&nbsp;</div>

<div>&nbsp;</div>

<div>Thanks in advance!</div>

<div>&nbsp;</div>

<div>Best regards,</div>

<div>&nbsp;</div>

<div>Stefan</div>

<div>&nbsp;</div>

<div>&nbsp;</div>

<div>&nbsp;</div>

<div><u>Following the configuration:</u></div>

<div>&nbsp;</div>

<div style="padding-left:35.4pt;">node lxds05 \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; attributes standby=&quot;off&quot;</div>

<div style="padding-left:35.4pt;">node lxds07 \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; attributes standby=&quot;off&quot;</div>

<div style="padding-left:35.4pt;">primitive apache2 ocf:heartbeat:apache \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params configfile=&quot;/etc/apache2/apache2.conf&quot; httpd=&quot;/usr/sbin/apache2&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;apache2-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0&quot; timeout=&quot;240&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0&quot; timeout=&quot;240&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;15&quot; timeout=&quot;20&quot; start-delay=&quot;0&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta target-role=&quot;started&quot; failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive omd_site_main ocf:omd:omdnagios \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params site=&quot;main&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;30s&quot; timeout=&quot;30s&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0s&quot; timeout=&quot;240s&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0s&quot; timeout=&quot;240s&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta target-role=&quot;Started&quot; failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive pri_drbd_omd ocf:linbit:drbd \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params drbd_resource=&quot;nagios&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;drbd_disk-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;10&quot; timeout=&quot;240&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive pri_fs_omd ocf:heartbeat:Filesystem \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params device=&quot;/dev/drbd0&quot; directory=&quot;/opt/omd/&quot; fstype=&quot;ext4&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;pri_fs_omd-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0&quot; timeout=&quot;240&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0&quot; timeout=&quot;360&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;15&quot; timeout=&quot;20&quot; start-delay=&quot;0&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op notify interval=&quot;0&quot; timeout=&quot;20&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta target-role=&quot;started&quot; failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive pri_nagiosIP ocf:heartbeat:IPaddr2 \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params ip=&quot;192.168.12.21&quot; cidr_netmask=&quot;24&quot; iflabel=&quot;NagiosIP&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;pri_nagiosIP-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0&quot; timeout=&quot;20&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0&quot; timeout=&quot;20&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;10&quot; timeout=&quot;20&quot; start-delay=&quot;0&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta target-role=&quot;started&quot; failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive res_MailTo_1 ocf:heartbeat:MailTo \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params email=&quot;stefan.senftleben@itsc.de&quot; subject=&quot;nagios-group&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;res_MailTo_1-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0&quot; timeout=&quot;10&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0&quot; timeout=&quot;10&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;10&quot; timeout=&quot;10&quot; start-delay=&quot;0&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive res_MailTo_2 ocf:heartbeat:MailTo \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params email=&quot;stefan.senftleben@itsc.de&quot; subject=&quot;omd_site_main&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;res_MailTo_2-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0&quot; timeout=&quot;10&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0&quot; timeout=&quot;10&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;10&quot; timeout=&quot;10&quot; start-delay=&quot;0&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">primitive res_ping_1 ocf:pacemaker:ping \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; params multiplier=&quot;1000&quot; host_list=&quot;192.168.12.1 192.168.12.2 192.168.12.13&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; operations $id=&quot;res_ping_1-operations&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op start interval=&quot;0&quot; timeout=&quot;60&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op stop interval=&quot;0&quot; timeout=&quot;20&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op monitor interval=&quot;10&quot; timeout=&quot;60&quot; start-delay=&quot;0&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; op reload interval=&quot;0&quot; timeout=&quot;100&quot;</div>

<div style="padding-left:35.4pt;">group nagios-group pri_fs_omd pri_nagiosIP apache2 \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta target-role=&quot;started&quot; failure-timeout=&quot;60&quot;</div>

<div style="padding-left:35.4pt;">ms ms_drbd_omd pri_drbd_omd \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta clone-max=&quot;2&quot; notify=&quot;true&quot;</div>

<div style="padding-left:35.4pt;">clone cl_ping_1 res_ping_1 \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; meta clone-max=&quot;2&quot; notify=&quot;true&quot;</div>

<div style="padding-left:35.4pt;">location loc_drbdmaster_ping ms_drbd_omd \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rule $id=&quot;loc_drbdmaster_ping-rule&quot; $role=&quot;Master&quot; 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=&quot;cib-bootstrap-options&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; expected-quorum-votes=&quot;2&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; stonith-enabled=&quot;false&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dc-version=&quot;1.0.8-042548a451fce8400660f6031f4da6f0223dd5dd&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; no-quorum-policy=&quot;ignore&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cluster-infrastructure=&quot;openais&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; last-lrm-refresh=&quot;1320683212&quot;</div>

<div style="padding-left:35.4pt;">rsc_defaults $id=&quot;rsc-options&quot; \</div>

<div style="padding-left:35.4pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; resource-stickiness=&quot;100&quot;</div>

<div>&nbsp;</div>

<div>&nbsp;</div>

<div><font color="#32AC54">&nbsp;</font></div>

<div>&nbsp;</div>

<div>&nbsp;</div>

</span></font>

</body>

</html>