[DRBD-user] Trying to Understanding crm-fence-peer.sh

[Bryan K. Walton]

I'm trying to understand what and how crm-fence-peer.sh does what it
does.  I'm using DRBD 8.4 with Pacemaker in a two node cluster, with a
single primary.

I'm doing fabric fencing.  And I believe I have my stonith setup
configured correctly.  I have the following in my drbd config:

handlers {
	fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
	after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh";
	...
	}

disk {
	fencing resource-and-stonith;
	...
	}

I can run "stonith_admin -F <node>" and the
switch ports for the other node will get disabled.  Similarly, I can run
"pcs stonith fence <node> --off" and I will get the same result.

Now, I'm doing more fence testing, like running "init 6" on the primary 
node that is also the DC.  When I do this, I see the following in logs of
the surviving node:

Jan 11 08:49:53 storage2 kernel: drbd r0: helper command: /sbin/drbdadm
fence-peer r0
Jan 11 08:49:53 storage2 crm-fence-peer.sh[15594]:
DRBD_CONF=/etc/drbd.conf DRBD_DONT_WARN_ON_VERSION_MISMATCH=1
DRBD_MINOR=1 DRBD_PEER=storage1 DRBD_PEERS=storage1
DRBD_PEER_ADDRESS=192.168.0.2 DRBD_PEER_AF=ipv4 DRBD_RESOURCE=r0
UP_TO_DATE_NODES='' /usr/lib/drbd/crm-fence-peer.sh
Jan 11 08:49:53 storage2 crm-fence-peer.sh[15594]: INFO peer is
reachable, my disk is UpToDate: placed constraint
'drbd-fence-by-handler-r0-StorageClusterClone'
Jan 11 08:49:53 storage2 kernel: drbd r0: helper command: /sbin/drbdadm
fence-peer r0 exit code 4 (0x400)
Jan 11 08:49:53 storage2 kernel: drbd r0: fence-peer helper returned 4
(peer was fenced)

But the switch ports connected to the fenced node are still enabled.

What am I missing here?  

Thanks!
Bryan Walton

-- 
Bryan K. Walton                                           319-337-3877 
Linux Systems Administrator                 Leepfrog Technologies, Inc