Hello list, I've got a problem with the following part of the DRBD Howto at http://www.linux-ha.org/DRBD/HowTov2
----------------- Specifying the nodes where drbd can be run If you only have a two node cluster, you could skip this step, because obviously, it can only run on those two. If you want to run drbd0 on two out of more nodes only, you will have to tell the cluster about this constraint: <rsc_location id="drbd0-placement-1" rsc="ms-drbd0"> <rule id="drbd0-rule-1" score="-INFINITY"> <expression id="exp-01" value="xen-1" attribute="#uname" operation="eq"/> <expression id="exp-02" value="xen-2" attribute="#uname" operation="eq"/> </rule> </rsc_location> These two constraints tell the Policy Engine that, first, drbd0 can not run anywhere else except on xen-1 or xen-2. Second, they tell the PE that yes, it can run on those two. ------------------ If I understand the logic of the rules correctly, the expressions will be concatenated by 'and' (the default), and the first expression being true if and only if evaluated on (or for ?) node xen-1, the second on xen-2, both can never be true, so the rule will never apply. In my opinion it would make much more sense if the operation attributes of the expressions where 'ne' instead of 'eq'? Furthermore I think that the last two sentences of the excerpt above are somewhat misleading. How can one rule tell two different things ...? Or is there a fundamental misunderstanding on my side? Thanks in andvance, Klemens -- Klemens Kittan Systemadministrator Uni-Potsdam, Inst. f. Informatik August-Bebel-Str. 89 14482 Potsdam Tel. : +49-331-977/3125 Fax. : +49-331-977/3122 eMail : [EMAIL PROTECTED] gpg --recv-keys --keyserver wwwkeys.de.pgp.net 6EA09333
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