Re: HA Clustering with RAC

slurper <slurper1234_at_hotmail.com> wrote in message news:<4059ae36$0$13855$ba620e4c_at_news.skynet.be>...
> Ulf wrote:
>
> > Hi guys,
> > I'm writing my diploma thesis about Disaster Recovery. I try to differ
> > types of cluster depending of the layer where they are realized.
> > Here is my point of view:The aim of a cluster is, that there is an
> > automatic failover of resources to the secondary site that no
> > transaction is lost.This means that the OS, the database and the
> > application (e.g. SAP R/3) must be active on the secondary site.
> that's a high availability cluster (with failover: two machines, checking
> each other's health, and the other taking over when one fails)
> you also have load-balancing clusters (for scalability, reliability,
> resilience)
> good book: "Load balancing servers, firewalls and caches" from Chandra
> Kopparapu
> good site: linux-ha.org
> interesting project to give you insight in the material: linux virtual
> server.
>
> it's a very interesting topic, but overwhelming at the start (many complex
> relationships between different aspects of a computer system)
>
> linux is ideal to experiment with such techniques.
>
>>Thanx for your answer....right,it's quite complex!*g*
>
> > Here are my questions:
> > On which layer (OS,DBMS,Application) is the failover realized? Can it
> > be realized on different layers?Which application does support this
> > function? Or have all applications to support this function?
> > Do you always need a special cluster software like HACMP?
> >
> > I would be glad, if you could answer my questions and give me links
> > where I can read something about this.
> >
> > Bye
Received on Thu Mar 18 2004 - 22:02:57 CET