Patching doubts

I am performing patching. The patching is going fine and there is nothing wrong in that. Actually we are patching the rac environment so all the environment has got min four nodes. Actually in the instructions we are asked to patch in each and every node. Consider the same db is running in all four nodes. My doubt here is as we patch only the oracle home gets patched right? so even if there are four nodes there will be only one shared oracle home so in this case why we need to patch each and every node? Please forgive if my question is stupid or if my understanding on the RAC is poor.

CKPT wrote:
Hi,
Even in RAC, database only will be in shared storage..
But ORACLE_HOME wil be installed in each server and its stand alone. It is not shared to all the nodes. So we need to apply on each node.
Hope you understood.Ya i can imagine that. But even in 10g we dont have the option of sharing the oracle software. I read something like this in a document.
Oracle 10g supports the sharing of the Oracle software by design – and in fact the named listener approach is the one taken for the situation in the example above.For 9i, the solution was to duplicate the Oracle software locally on each node – with the administrative overhead for tasks like patching increasing along with the number of nodes in the cluster. In order to lessen the burden with managing node-local Oracle software installations, the Oracle Installer transparently applies patches to all nodes in the cluster when the patching is applied to single node.
Although 10g is designed to support cluster-wide sharing of Oracle software, should you do it? Keep in mind that if you do so, the availability of the Oracle software becomes a potential single point of failure for the whole cluster compared to the local per-server installation approach.
We also have a grid environment where it is 16 node so according to you all these should be patched individually right?

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