Hi

I need to upgrade 4 servers to NW 6.5sp4a from nw 5.1sp8.Two servers are
already upgraded to NW 6.5 sp4a.The DS version is 8.7.3.3 across all servers
The master replica server is still Nw 5.1sp8.
Do I need run the Deployment manager and upgrade the schema ????
And PKI do i need to upgrade that ????

Or is it ok to just upgrade the boxes to NW 6.5sp4a.

Thanks
Minesh