Do i need to Run ADPREP/ Forest Prep

[kchamburglar]

So we had a “Cyber Incident” back in November, no I will no elaborate further. lol

HOWEVER, we were a mixed bag of 2012 R2 and 2019 servers Domain/Forest is functional Level 2012 R2.

We lost all but one DC so when we started the rebuild we just did all 2019 DC and got replication health all goo and have 7 DC’s in total.. We are a 1 domain/forest…

My question since all the DC’s are 2019 and they were new installs and promoted to domain controllers and not upgrades do we need to run adprep or since they are already 2019 and weren’t upgrades did that run before i raise the functional level?

backed up GPO earlier this week.

[Rod-IT]

@kchamburglar

do we need to run adprep

Short version is no.

Longer version, Installing newer version DCs will do that as part of their pre-installation check, it wont upgrade function levels, but will extend the schema accordingly to suit the new OS levels. Both domain and forest preps will run for you. You do not need to re-run these.