Dejan Muhamedagic wrote:
> On Fri, Mar 30, 2007 at 11:13:48AM +0200, Max Hofer wrote:
>> On Thursday 29 March 2007 22:32, Dejan Muhamedagic wrote:
>>> On Thu, Mar 29, 2007 at 06:36:15PM +0200, Max Hofer wrote:
>>>> I have a questiuon regarding the heartbeat messgage exchange.
>>>>
>>>> Currently i have 2 cluster systems, each consisting of 2 node:
>>>> - cluster A consists of nodes A1, A2
>>>> - cluster B consists of nodes B1, B2
>>>>
>>>> All 4 nodes are attached with bonded interface to a tow LAN
>>>> switches SW1 and SW2 (lets call it normal LAN).
>>>>
>>>> A1 and A2 (and B1 and B2) have a direct interconnection where
>>>> the DRBD devices are syncronized plus a serial cable (lets call it
>>>> DRBD LAN)
>>>>
>>>> Thus currently cluster A (and B) use 3 different ways to exchange
>>>> the heartbeat packages:
>>>> - bcast ofer the DRDB LAN
>>>> - ucast using normal lan
>>>> - the serial cable
>>>> I see 2 possible solutions:
>>>> a) wrting a resource agent which polls the state from the other cluster
>>>> and i use this state
>>> Interesting idea. Not sure how tricky it would be to do right.
>>> Depends also what for you would use that state. I guess to restart
>>> some resources.
>> My problem with this solution that i do not use the action-serialzing effect
>> of the transition engine.
>
> I don't really get this one.
Me neither...
>>>> b) i configure 1 single cib.xml with 2 "sub-clusters"
>>> This is an obvious solution, but probably you'd have to do some
>>> rewiring, i.e. all nodes should be equally well connected with
>>> each other.
>> This is out of question because i can not interconnect all nodes to each
>> other with a serial cable or with a directy LAN cable.
>
> You could use a switch in case there are no security issues. I'm
> afraid that they really have to be able to talk to each other.
It is the case that heartbeat expects effectively a star topology. In
fact, even if we worked around it, we might schedule resources that
violate the topology, because we didn't understand it.
You ever think about using IP routes? Then everything would just work :-).
--
Alan Robertson <[EMAIL PROTECTED]>
"Openness is the foundation and preservative of friendship... Let me
claim from you at all times your undisguised opinions." - William
Wilberforce
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