[Linux-cluster] Is there any backup heartbeat channel

[Hakan VELIOGLU]

Thanks for all the answers.

I think there is realy no backup heartbeat channel. Maybe the reason  
is GFS. DLM works on the heartbeat channel. If you lost your heartbeat  
you lose your lock consistency so it is better to fence the other  
node. For this reason I think if you don't have enough network  
interface on server and switch, loosing the heartbeat network may shut  
all the cluster members.

Hakan VELİOĞLU


----- robejrm at gmail.com den ileti ---------
   Tarih: Thu, 13 Aug 2009 10:42:11 +0200
  Kimden:  Juan Ramon Martin Blanco <robejrm at gmail.com>
Yanıt Adresi:linux clustering <linux-cluster at redhat.com>
    Konu: Re: [Linux-cluster] Is there any backup heartbeat channel
    Kime: linux clustering <linux-cluster at redhat.com>


> 2009/8/13 Hakan VELIOGLU <veliogluh at itu.edu.tr>
>
>> ----- raju.rajsand at gmail.com den ileti ---------
>>  Tarih: Thu, 13 Aug 2009 08:57:15 +0530
>>  Kimden:  Rajagopal Swaminathan <raju.rajsand at gmail.com>
>> Yanıt Adresi:linux clustering <linux-cluster at redhat.com>
>>   Konu: Re: [Linux-cluster] Is there any backup heartbeat channel
>>   Kime: linux clustering <linux-cluster at redhat.com>
>>
>>
>>  Greetings,
>>>
>>> 2009/8/12 Hakan VELIOGLU <veliogluh at itu.edu.tr>:
>>>
>>>> Hi list,
>>>>
>>>> I am trying a two node cluster with RH 5.3 on Sun X4150 hardware. I use a
>>>>
>>>
>>> IIRC, Sun x4150 has four ethernet ports. Two can be used for outside
>>> networking and two can be bonded and used for heartbeat.
>>>
>> I think, I couldn't explain my networking. I use two ethernet ports for xen
>> vm which are trunk and bonded ports. Then there left two. Our network
>> topology (which is out of my control) available for one port for server
>> control (SSH).
>
> So you can't use a bonded port for both server management  and cluster
> communications, can you? You can configure an active-passive bonding and
> then you can have many virtual interfaces on top of that, i.e: bond0:0,
> bond0:1 and assign them the ip addesses you need.
>
>
> I use the other one with a cross over cable for heartbeat. So there is no
>> way for bonding these two interfaces. Of course if I buy an extra switch I
>> may do this.
>
> You can connect them to the same switch (though you lost kind of
> redundancy), or you can use two crossover cables and move the management IP
> to the same ports you are using for the vm's.
>
> Greetings,
> Juanra
>
>>
>> I don't realy understand why there is no backup heartbeat channel. LVS and
>> MS cluster has this ability.
>>
>>>
>>> ALOM can be used for fencing and can be on a seperate subnet if required.
>>>
>> I used this for fencing_ipmilan.
>>
>>>
>>> Regards
>>>
>>> Rajagopal
>>>
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>>>
>>>
>>
>> ----- raju.rajsand at gmail.com den iletiyi bitir -----
>>
>>
>>
>>
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>


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