What is the quickest to upgrade disaster recovery system to NW04s in MSCS?

Hi,
I have an issue which I need assistance from SAP/Windows 2003 experts.
Hope you can share your opinion on an SAP upgrade issue we're grappling with.
Objective : Upgrade our SAP Bank Analyzer disaster recovery environment from NW04 to NW04s SR2, to be same as production. Both production and disaster recovery (DR) run under two node WIN2003 Enterprise MSCS. The SAP CI usually runs on node A and Oracle 10g runs on node B.
The Oracle software, parameters, database files and the SAP folder \usr\sap are already matching. These files and folders are on EMC mirrored disks, so this will be automatically synchronized from production status.
Therefore I believe it is only the SAP software components on the local hard disks - binaries, DLLs, registry, DCOM, environment variable etc, that need to be upgraded on the two DR machines.
For your information, the current SAP 6.40 instance, Oracle 10g instance, MSCS failover capability are all working in the DR environment as we just did an exercise a month ago to prove this.
 Disaster Recovery Environment :
On shared drives that are synchronized between prod and DR : SAP folder \usr\sap including the kernel binaries, Oracle parameter files, database datafiles, redologs, sapbackup etc.
Issue : What is the quickest and reliable method to achieve the objective? Other than the SAP kernel binaries and profiles, I'm not certain what other related components are updated/replaced that are stored locally on each of the clustered machine.
There are three different approaches we can think of :
1) Repeat the whole NW04s upgrade process in the DR environment. This takes several days. The exposure of not having a disaster recovery environment for several days is a minus.
 or
2) Un-install the SAP CI and MSCS definitions. Synchronise the DR shared disks from production to have the upgraded production NW04s database contents and SAP folder \usr\sap.
Use SAPINST to re-install either traditional CI or ASCS option 'System Copy". And then re-create the MSCS definitions for SAP CI using SAPINST again.
The disadvantage is I can't trial this in any other of our environments. Also, we want to run with the traditional CI instead of ASCS until early next year for other reasons. So we would have to reverse the ASCS back to traditional CI with this method, by reversing the steps in OSS NOTE 101190 "Splitting CI after upgrade to 700".
 or
3) Somehow identify all the SAP components that are stored locally on each machine (eg. environment variables, registry settings, DCOM definitions, DLL in various folders). Then just copy them from Production to DR machines or recreate them. I'm not confident of identifying the local SAP components. And I have not been able to find any good OSS NOTEs or forum threads on this topic. The most helpful OSS NOTE I can find is 112266 point 13 and 19.
Thanks for any input.
Benny Kwan

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