MSI mode in R12.2.5

[tanweer]

Dear Erman,

We are unable to get much information on MSI mode in R12.2,We are on AD/TXK delta 7 with R12.2.5 version.

Even if nodemanager and admin server are down,we are able to start managed servers using MSI mode.But how msi mode works,Is it using native scripts like starmanagedwebloc.sh which does not use nodemanager to start managed servers?

can we make config changes when managed serves are running in MSI mode?
Your support is highly appreciated

Thank you

[ErmanArslansOracleBlog]

msi means managed server independence.. As the first node is down, our Admin server is down, so the managed servers (like oacore) can not be started on the second node unless using the msimode argument..
Without the msimode, managed servers will try to reach the admin server for reading their configuration and they will fail.. Without msimode, we see errors like "ERROR: Skipping startup of forms_server2 since the AdminServer is down", while executing the adstrtal.sh.

Here is the defition of msi mode (from Oracle):
When a Managed Server starts, it tries to contact the Administration Server to retrieve its configuration information. If a Managed Server cannot connect to the Administration Server during startup, it can retrieve its configuration by reading configuration and security files directly. A Managed Server that starts in this way is running in Managed Server Independence (MSI) mode.

[tanweer]

Will MSIMODE use nodemanager to start managed servers?

[ErmanArslansOracleBlog]

No.
Those 2 are incompatible already.

Additional  info: for instance you cannot use Node Manager to start a server instance in MSI mode, only to restart it. For a routine startup, Node Manager requires access to the Administration Server.

You see..