Sorry for my english,
I have Windows Server 2003 R2 SP2 (2003 level) domain with two domain controllers.
Even though everything seems to be working fine - DCDIAG, NTFRSUTL and other diagnostic tools do not return any errors, there's no any errors in DC's logs either, the SYSVOL shares doesn't seems to be in sync. Logon scripts modyfied on one of them are never saved to another, and vice versa. The same situation with Group Policies.
The FRS services are running. I was thinking that maybe they do synchronize with SYSVOL in different location on the hardrive somehow, but there doesn't seem to be any other folder identical to the sysvol on another server :/