BECAUSE a node: downtime after HW-power outage?
HelloA CCR node seems to be a good alternative to a "regular" CARS
Since we have no experience with a CCR node we are currently available literature and try to get a picture of the advantages/disadvantages.
An important point is the question "what exactly happens when a HW failure or outage occurs? It is my understanding - and what Oracle has documented - providing the Oracle Clusterware failover protection for Oracle RAC one node. If the node fails, Oracle Clusterware automatically detect the failure and restart the Oracle RAC database a node on another server in the pool.
In our case, we would have the active node in Datacenter 1, the passive node in the data center 2. So if the node in Datacenter 1 fails, the database should start on node 2 data center.
Now my questions are:
-who really automatically will be?
-What happens to the sessions that have been connected to the database before the HW failure?
-is it possible to determine how long will take this failover?
I'm sure someone has already tested this situation - any help will be appreciated.
Rgds
JH
Published by: VivaLaVida on 05.12.2012 08:57
Hello
Now my questions are:
-who really automatically will be?
Yes, automatic and transparent
-What happens to the sessions that have been connected to the database before the HW failure?
Depends on if you use emotive connection will be redirected to another node, if you have cold failover, the client will be a short downtime.
-is it possible to determine how long will take this failover?
Dependent failure, but normal (could failover) is on range from 1 to 3 minutes, using (emotive - Hot failover) without interruption.
Read:
http://www.Oracle.com/technetwork/products/Clustering/overview/UG-raconenode-2009-130760.PDF?ssSourceSiteId=otncn
Maybe this can clarify your questions.
Ask any question.
Kind regards
Levi Pereira
Published by: Levi Pereira on December 5, 2012 11:58
PS: Ignore use of emotive if you have 'downtime after HW-break. " Consider only cold failover.
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