How can two Alfresco live together?

[lamarifm]

We have an old Alfresco 2.2.3 with millions of documents, and we have many web services accesing this data using domument's uuid. Now we need to change to a most recent version of alfresco, because we have perfomance problems.
We tried to migrate data, but it was very difficult. Now I think the best way could be to have two alfresco living together.   Wich is the best way?
I think we can  write in the most recent version and when we need a document (by uuid), we consult in both systems. But could it exist the same uuid in both? This is a problem to my web services.

[eswbitto]

You should probably have a look at this.

http://docs.alfresco.com/5.0/concepts/upgrade-path.html

[lamarifm]

Thanks ESWBitto!! This is the way my organization followed to do migration. Exactly 2.2.3 -> 2.2.8 -> 3.4.6. This method worked fine for my initialtest, but an enterprise tried to do it with high volumes of data in production systems and they said it was not possible.

[afaust]

Hello,

such a migration is definitely possible, but requires some careful preparation. We did an upgrade for a customer who was on 2.2.x via 2.2.8 to the destination version of 3.4.7 (or a even a later service pack) a few years back. I've also recently done an upgrade of a customer with about 25 million documents. Generally, the volume does not matter as long as the data quality isn't too bad or you aren't trying to change too many things customization-wise during the upgrade.
If you are still an active Enterprise customer, I'd advise you to contact either a local Alfresco partner or the regional Alfresco customer account / sales manager, to discuss upgrade support options. Since you might not be in the geographical area where my employer is operating, I can't assume we'd be able to support you (of course, if you are you can drop any inquiries via our <a href="www.prodyna.com">homepage</a> contact form).

Regards
Axel

[lamarifm]

We have worked with two Alfresco parnerts in my region, but results was not as desired. Unfortunatelly I can´t  work with other regions partners. The only way at moment is try to do it myself.

Thanks a lot.