RE: Oracle CRS and Split Brin

It is used to settle races...such as in a 3 node meltdown...which 2 will
survive?  

 

________________________________

From: amonte [mailto:ax.mount@xxxxxxxxx] 
Sent: Thursday, March 29, 2007 4:34 PM
To: Kevin Closson
Cc: Naqi Mirza; oracle-l@xxxxxxxxxxxxx
Subject: Re: Oracle CRS and Split Brin

 

Hi Kevin

 

What are the voting disk roles in a split brain scenario?

 

Thanks

 



 

On 3/29/07, Kevin Closson <kevinc@xxxxxxxxxxxxx> wrote: 

 

Kevin mentioned that in a split brain scenario the lower node would
survive always

 

...It appears as though it is the lowest as per the CRS node number, but
not the lowest IP...but again, I'm likely confusing things because the
formula is not clearly available and we are talking about true split
brain where there is a clean hemispherical split of the cluster
(1/1,2/2). Split brain resolution techniques/algorithms are the family
jewels of clusterware. The way things are these days, you generally find
out more about how they work after they are patented as is the case here
at PolyServe (I mean HP): 

 

PolyServe 7,148,853
<http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PAL
L&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7149853.PN.&OS=P
N/7149853&RS=PN/7149853> 

 

  7,148,853 is on of the many algorithms that come into play when there
are cluster meltdowns in a PolyServe cluster.

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