[Pacemaker] Unnecessary shuffling of master/slave resources and maybe a split brain

[Adrian Chapela]

Dominik Klein escribió:
>> What are you saying me ? I should have another communication channel 
>> as a COM port... I could test this with a null modem cable.
>
> You need at least 2 connections between the nodes. It never was 
> different.
>
> It once was true that a null modem oder serial cable as the second 
> connection was enough - from my _personal_ experience, having 2 
> ethernet connections is better (because faster and able to cope with 
> the rather high traffic of v2 (pacemaker)).
I tested two options. I think the best option is a second ethernet card. 
I have configured this option but I saw that my cluster didn't do a 
failover.
The two connections are in different networks (One in 192.168.18.X and 
other in 172.16.1.0) but I don't know why pingd isn't going down all of 
resources.

I have this connectivity constraint:
        <rsc_location id="mail-connectivity" rsc="Mail-drbd">
                <rule id="mail-pingd-prefer-rule" score="-INFINITY" 
role="Master">
                        <expression id="mail-pingd-prefer" 
attribute="pingd" operation="lt" value="1000"/>
                </rule>
        </rsc_location>



        <rsc_location id="samba-connectivity" rsc="Samba-drbd">
                <rule id="samba-pingd-exclude-rule" score="-INFINITY" >
                        <expression id="samba-pingd-exclude" 
attribute="pingd" operation="lt" value="1000"/>
                </rule>
        </rsc_location>

And this colocation:
 <rsc_colocation id="mail_drbrd_rule" rsc="Mail" with-rsc="Mail-drbd" 
with-rsc-role="Master" score="INFINITY"/>
 <rsc_colocation id="samba_drbrd_rule" rsc="Samba" with-rsc="Samba-drbd" 
with-rsc-role="Master" score="INFINITY"/>

The node lost connectivity with 192.168.18.0 (I defined all host in 
this  network for pingd) and pingd value should be less than 1000.
>
> Regards
> Dominik
>
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