Diff between shared appl_top and multinode

Dear all,
Can anyone tell me know what is the difference among shared appl_top ,shared application tier file system and a multinode installed system..
Advance Thanks
Kai

1) Is the above shared application tier or shared appl_topNeither Shared APPL_TOP nor Shared Application File System.
2) If so, if it shared application tier, how can we say appl_top and
comn_top ,Application Tech Stack are mounted ....we are only sharing the service.You only share the storage. So, instead of having multiple copies of APPL_TOP/COMMON_TOP, you just have one copy shared between the two nodes. This means, if you do any changes to APPL_TOP/COMMON_TOP from Server 1, then you can see the change on Server 2.
> 3) if it is not a shared appl_top, what change has to
be made in the above scenario to make it shared appl_top.. To make it:
Shared APPL_TOP --> You need to include COMMON_TOP (in addition to APPL_TOP).
Shared Application File System --> You need to include COMMON_TOP, 8.0.6 ORACLE_HOME, iAS ORACLE_HOME (in addition to APPL_TOP).
4) How it is said that the appl_top,comn_top and ora
are shared..we are only distributing the services.. Again, shared means the same storage can be accessed by both nodes. Any changes made in the shared storage are immediately visible on all nodes.
In traditional multi-node installation, you have more than once copy on APPL_TOP/COMMON_TOP, so whenever you need to apply an application patch, you have to run it on each node which has APPL_TOP. In the Shared APPL_TOP configuration, you only need to apply the patch once, since the change will be visible immediately to the other node.
No matter you have Shared APPL_TOP or Shared Application File System or traditional multi-node installation, by the end you will be running CM on Server 1, and Forms/Web on Server 2.
Hope it is clear now :)

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