RE: clustering

Hrrrmm - well, we've never seen the problem you describe, and we've got a pretty big RAC environment here (clusters from two to six nodes, and we combine dev clusters to build bigger ones as we need). What the situation you describe sounds like is what happens when there's interconnect failure. Each node thinks independently that its been separated from the rest of the cluster and (effectively) shoots itself in the head. This causes every instance to hang. This is why the crafty RAC Jedi designs well their interconnect architecture.  

But yes, if you're willing to take the "completely 2n capacity" cluster route and have two databases, double the oracle licenses, two storage arrays, two fibre channel networks, etc. , that is the highest availability/reliability cluster you can have - although at the highest cost and complexity.  

Which clustering solution is right for you? Cheap and inelegant? Expensive and bullet-proof? Well, that's why we get paid the big bucks, right? :)  

Thanks,
Matt

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Matthew Zito
GridApp Systems
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Cell: 646-220-3551
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-----Original Message-----
Tanel Poder
Sent: Monday, July 28, 2003 7:05 PM
To: Multiple recipients of list ORACLE-L


However, failed transactions must be handled from client side. Queries
may migrate to surviving nodes transparently.
Also, currently RAC has many problems, such all nodes hanging when one
node dies. Completely separate systems are still (an will always be) the
most available solution.
 
Tanel.
 
----- Original Message ----- 

To: Multiple recipients of list ORACLE-L <mailto:ORACLE-L_at_fatcity.com>  
Sent: Monday, July 28, 2003 7:49 PM


Another Important different is that RAC is best High Availability
solution in case of System/Instance Failure where in case of HP or
Veritas Cluster, all of the resource get stopped on live system/node of
the cluster and then get started on second node and hence user will be
affected. But in case of system or Instance failure, there is seamless
transition of the User session in RAC 


Indy Johal




	"Ron Rogers" <RROGERS_at_galottery.org> 
Sent by: ml-errors_at_fatcity.com 


07/28/03 12:29 PM 
Please respond to ORACLE-L 


        
        To:        Multiple recipients of list ORACLE-L
<ORACLE-L_at_fatcity.com> 
        cc:         
        Subject:        Re: clustering	



ak,
As I understand it, an HP cluster is 2 boxes that have the capability
to access the same disks and data but only one can have the oracle
instance running and accessing the datafiles(active). Sort of like a
high availability option.
With RAC both boxes can access the instance and datafiles at the same
time.
List, Correct me if I need it.
Ron



>>> oramagic_at_hotmail.com 07/28/03 12:14PM >>>

Hi Guys ,
I am new to this clustering concept. Just trying to understand few
basics . Need ur help .

what is differece between oracle running on sun /hp cluster with 2
nodes and oracle with RAC running on 2 nodes ?  

thanks,
-ak
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