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

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Wed Dec 16 02:36:04 EST 2015

>>> "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...


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