[ClusterLabs] Antw: Re: design of a two-node cluster

[Lentes, Bernd]

Ulrich wrote:

----- On Dec 16, 2015, at 8:36 AM, Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de wrote:

>>>> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> schrieb am 16.12.2015 um
> 00:35 in Nachricht
> <1621336773.386234.1450222516246.JavaMail.zimbra at helmholtz-muenchen.de>:
> 
> [...]
>> What is about a quorum disk ? I also read about "tiebrakers" or that STONITH
>> is magically able to chosse the right
>> node to fence (i can't believe that).
> 
> If you read "the right" as "not both" it's OK ;-)
> 
> In HP Service Guard they used a "lock disk" (SCSI disk) as tie breaker: On split
> brain every node tried to "SCSI reserve" the unit, which only one node
> suceeded. Then (in an SBD like manner) the name of the survivor was written on
> to the disk (I guess), and every other node committed suicide (that's different
> from STONITH where external nodes kill another, AFIK). Something like that is
> still missing.
> 
> Personal note: Bernd, I think it's time to try things now. You discussed a lot,
> but I still think you never tried the proposals...
> 
Yes, you are right. But i like to have an idea of what will i do before, rather than testing "which design do i want to have ?"
It will still remain a lot to test.
I just have to wait for the second HP server we will order in january.
We are a public institution and orders sometimes require a lot of time. You work at an university, maybe you experience the same ...

Bernd
   

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