[Pacemaker] Multiple DRBD resources how best to configure resources on top.

[Brett Delle Grazie]

Hi,

If I have two DRBD resources:
resourceA
resourceB

What's the best way to configure the constraints in pacemaker so that
a tomcat resource, which serves both of them when mounted,
will not be started unless they are both present? My current
configuration (below) fails to migrate correctly when drbd_B fails due
to network glitch
and tomcat fails to stop.  In this case, the demote on drbd_B fails
because the directory is still mounted and I end up with a split brain
scenario.  Basically I want to force drbd_A and drbd_B to be master on
the same system.

Currently I have:
node nodeA
node nodeB

primitive drbd_A ocf:linbit:drbd \
        params drbd_resource="A" \
        op start interval="0" timeout="240" \
        op stop interval="0" timeout="100" \
        op monitor interval="30"
primitive drbd_B ocf:linbit:drbd \
        params drbd_resource="B" \
        op start interval="0" timeout="240" \
        op stop interval="0" timeout="100" \
        op monitor interval="30"

primitive fs_A ocf:heartbeat:Filesystem \
        params device="/dev/drbd/by-res/A" directory="/mnt/A"
fstype="ext3" options="defaults,noatime" \
        op start interval="0" timeout="60" \
        op stop interval="0" timeout="60" \
        op monitor interval="60" timeout="40" depth="0"
primitive fs_B ocf:heartbeat:Filesystem \
        params device="/dev/drbd/by-res/B" directory="/mnt/B"
fstype="ext3" options="defaults,noatime" \
        op start interval="0" timeout="60" \
        op stop interval="0" timeout="60" \
        op monitor interval="60" timeout="40" depth="0"

primitive tomcat_tc1 ocf:heartbeat:tomcat \
        params tomcat_user="tomcat" catalina_home="/opt/tomcat6"
catalina_base="/home/tomcat/tc1"
catalina_pid="/home/tomcat/tc1/temp/tomcat.pid"
catalina_rotate_log="NO" script_log="/home/tomcat/tc1/logs/tc1.log"
statusurl="http://localhost/manager/serverinfo"
java_home="/usr/lib/jvm/java" \
        op start interval="0" timeout="60" \
        op stop interval="0" timeout="20" \
        op monitor interval="60" timeout="30" start-delay="60"
primitive vip_1 ocf:heartbeat:IPaddr2 \
        params ip="10.xx,xx,xx" nic="bond0" iflabel="3" \
        op monitor interval="10" timeout="20"
group grp_1 fs_A fs_B vip_1 tomcat_tc1

ms ms_drbd_A drbd_A \
        meta master-max="1" master-node-max="1" clone-max="2"
clone-node-max="1" notify="true"
ms ms_drbd_B drbd_B \
        meta master-max="1" master-node-max="1" clone-max="2"
clone-node-max="1" notify="true"

location loc_ms_drbd_A ms_drbd_A 100: nodeA
location loc_ms_drbd_B ms_drbd_B 100: nodeA

colocation A_on_drbdA inf: grp_1 ms_drbd_A:Master
colocation B_on_drbdB inf: grp_1 ms_drbd_B:Master

order A_after_drbdA inf: ms_drbd_A:promote grp_1:start

Is there a better way to configure this?

Thanks for any help  /pointers.

-- 
Best Regards,

Brett Delle Grazie