Upgrading from R5 in AS400

I was planning to set up one server with R6 on the AS 400 that has four partitioned Domino R5 servers. Is it possible to install one R6 server on the same 400 that has 4 R4 servers or do I have to upgrade all the servers at the same time? THis is very important any help would be appreciated.

Thanks

Haba Goba

Subject: Upgrading from R5 in AS400

When you upgrade the Domino License Program on the iSeries, all Domino servers on the same iSeries box (without LPAR) or in the same OS/400 Logical Partition (LPAR) will be upgraded. The Domino servers are sharing the same Domino program codes.

At this time, the only way to have multiple Domino releases on an iSeries box is by having multiple OS/400 Logical Partitions.

Subject: RE: Upgrading from R5 in AS400

Thanks Aditya.