Decommission SAP server

[SAPSupport]

What is the procedure to decommission a SAP ECC server but still remain it read only to all users.

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[SAPSupport · Accepted solution]

KBA 3071066 - Decommission of SAP Systems points to the documentation to:

What are the pre-requisites need to be taken care before an SAP Instance decommission?
What are the steps and operations need to be done during SAP Instance decommission?