netlogon and sysvol

i was referring to this article because my additional DC was having problem : http://technet.microsoft.com/en-us/library/hh147324%28v=ws.10%29.aspx

question : do i change the sysvolready parameter on the DC without problem or on the DC with problem?

for example DC1, when i do a "net share" i can see sysvol and netlogon.

On DC2, i can't see sysvol and netlogon when i do a "net share".

so, where should i modify the registry? DC1, or DC2?

Thanks.