Low dependency to start between CARS and VIP instance when using Server Pools
The CCR, an Instance of database on a node requires a VIP to also run on this node, otherwise, the Instance does not start. This is known in the administration Guide RAC 11 GR 2 as a dependency of good start.
However, I believe now that server pools and bases managed policy introduced in 11 GR 2, there is now start low dependence means that the RAC Instance on one node can start even if the VIP is not started on the same node.
Q1. Is this because the VIP may be running on another node in the server for the VIP Pool?
Q2. So the VIP could be assigned to a Pool which has different nodes that the Server Pool assigned to the RAC database - is - right?
Q3. I guess that's not say that the Instance of FCAC does not have a VIP before starting, what he said, so that the VIP for this Instance may not necessarily be running on the same node as this Instance?
Trying to get my head around that! As in the past, that the only reason why a VIP would not not be running on the node for, would be if the node has failed and the VIP was inherited by another node. In this case there are 2 VIP on the same node, supported by the same Instance.
Q4. Now that we seem to be saying that is a VIP and the associated Instance could be on separate nodes - is that correct?
any advice greatly appreciated,
Thanks Jim
Hi Jim,.
This is a pretty good example of server pools:
An Introduction to RAC 11.2 server pools & #8211; All things Oracle
It is designed as a feature for clusters really big cars, that you divide into pools. And for each pool, you name the amount of servers, you want to have and the candidate. The clusterware chooses server on which to run your instances.
Yet, even in this case, you should have 1 VIP and 1 listener node by node rac. Saw 2 VIP on a node is only failover and a node without a VIP can support a listener running on the VIP. If the case in your Q3 will not happen even in a server pool.
You can play arround with resources as it moves to the CCR on a test system with:
srvctl move h
the default pool in 11g:
srvctl config serverpool
Concerning
Thomas
Tags: Database
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