How to deal with BDLS during 4.6C -- ECC 6.0 upgrade?

Hi,
I am currently performing an upgrade from 4.6C to ECC 6.0 and before which, I am also performing a data migration from x86 (Intel) servers to x64 (AMD) servers. So, we have three fresh AMD servers (DEV, QAS, PRD). While the current landscape (x86) is live, I migrated the data from PRD (x86) to DEV (x64) and performing the upgrade. I used the same data to perform upgrade on QAS (x64) also.
Now, performing the data migration and upgrade on the PRD (x64) would involve more downtime. So, in order to avoid that, have decided to split the whole process over two consecutive weekends. The plan is as follows:
Weekend 1:
Bring down the PRD (x86), do a complete backup and restore the same on PRD (x64), then perform the data migration activities on PRD (x64). Once this is done, we want to go live with the PRD (x64) running R/3 4.6C on MS SQL 2005 and Windows 2003, for one week (5 days - Monday through Friday).
And during these five days, I would perform the PREPARE phase.
Weekend 2:
I will start the upgrade on PRD (x64) on this weekend so that, we will get sufficient time to test and do post upgrade activities and decide to go live or not.
I hope the above procedure would work. What do you guys say?
Anyways, my question is, normally with the DEV and QAS, I perform the migration, PREPARE, upgrade and finally do the BDLS to convert the logical system to point to the new SID. But, with PRD, I cannot do so because, the system will go live with the new SID for one week. So, I may want to perform the BDLS on R/3 4.6C running on PRD (x64) and then perform the upgrade the following weekend. My question is, is it ok to do so?
NOTE: The SID in the x86 and x64 are not the same. I have mentioned above the same SID just for ease of reading and typing.
Thank you.

Hi Markus,
Sorry, it took a while to respond to your reply to my question. Yes, I understand that we don't have to convert the logical system. But, in our case, we use the production system database copy to upgrade the new development box. So, we have to convert the logical system in the newly upgraded Development system from the one that currently belongs to the 32 bit production system to a new logical system that is unique to the landscape. We cannot even use the logical system name that belongs to the 32 bit Development System because, that box is currently being used until we go live with the 64 bit production box. So, we will have to create a new logical system. In this case, as we want to maintain consistency in the logical system naming format across the new 64 bit landscape, we are probably forced to convert the logical system name on the 64 bit production box also.
So, now can you please advise, is it wise to convert to the new logical system after migrating the production server from 32 bit to 64 bit but, before the upgrade to ECC 6.0? As I had mentioned in my previous question, we will be live with the 4.6C on the 64 bit box for one week after migration to 64 bit but, before upgrade. In this case, I will have to connect to APO 64 bit and BI 7.0 64 bit (RFC) for one week before upgrade which, would need the logical system.
Or do you feel, we still can use the old logical system for the one week and after completing the upgrade, we can do the logical system conversion on the PRD to maintain naming consistency across the landscape?
Thank you.

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