[Linux-cluster] Is there any backup heartbeat channel

[Juan Ramon Martin Blanco]

2009/8/13 Hakan VELIOGLU <veliogluh at itu.edu.tr>

> 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.
>
There is no backup heartbeat channel because you should do the backup at a
operating system level, i.e: bonding
That's why you should use a bonded interface for the heartbeat channel with
at least 2 ethernet slaves; going further (for better redundancy) each of
the slaves should be on a different network card and you should connect the
each slave to a different switch.
But what I am trying to explain, is that you can use that bonded logical
interface also for things different from hearbeat. ;)

Greetings,
Juanra


> 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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>>
>
> ----- robejrm at gmail.com den iletiyi bitir -----
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