We run a Win 2008 R2 domain (forest/domain functional level) - in a parent/child domain configuration; all users and resources in the child domain. We want to upgrade to Win2012 R2 AD (mostly to stay current, and also because we want to start using DFS for our user profiles .. but that's another post). Anyway, as first steps toward domain upgrade, I am checking replication (and later dcdiag). And I am noticing something I am not understanding ..
My replication times seem to be increasing more than what I think should be normal. I have 4 sites - 2 have 1 DC each, 1 has 2 DCs, the last has 6 (3 DCs for the root domain, 3 DCs for the child domain). Doing "repadmin /replsummary" is showing me the largest delta is increasing between the servers in site #4, up to about an hour. And not going above 15 minutes or so for the other DCs in the remote sites. Mind you, there are no fails, no errors. Just oddly high times, and mostly in the "Source DSA" section (the times are much better in the "Destination DSA" section. And then they will drop down .. Look at the difference 100 seconds make, in the list of deltas: C:\Users\admin>repadmin /replsummary Replication Summary Start Time: 2014-09-16 09:58:09 Beginning data collection for replication summary, this may take awhile: ............. Source DSA largest delta fails/total %% error Site-1-001 14m:20s 0 / 12 0 Parent-Site-4-001 14m:20s 0 / 24 0 Parent-Site-4-002 14m:20s 0 / 24 0 Parent-Site-4-003 59m:20s 0 / 20 0 Site-4-001 59m:20s 0 / 38 0 Site-4-002 59m:20s 0 / 40 0 Site-4-003 10m:34s 0 / 34 0 Site-2-001 14m:20s 0 / 18 0 Site-3-001 14m:20s 0 / 24 0 Site-3-002 14m:20s 0 / 12 0 Destination DSA largest delta fails/total %% error Site-1-001 06m:53s 0 / 18 0 Parent-Site-4-001 11m:56s 0 / 20 0 Parent-Site-4-002 06m:31s 0 / 16 0 Parent-Site-4-003 01m:07s 0 / 16 0 Site-4-001 02m:00s 0 / 24 0 Site-4-002 08m:54s 0 / 38 0 Site-4-003 59m:20s 0 / 48 0 Site-2-001 :24s 0 / 12 0 Site-3-001 10m:34s 0 / 24 0 Site-3-002 05m:26s 0 / 30 0 C:\Users\admin>repadmin /replsummary Replication Summary Start Time: 2014-09-16 09:59:49 Beginning data collection for replication summary, this may take awhile: ............. Source DSA largest delta fails/total %% error Site-1-001 10m:33s 0 / 12 0 Parent-Site-4-001 10m:34s 0 / 24 0 Parent-Site-4-002 13m:36s 0 / 24 0 Parent-Site-4-003 13m:36s 0 / 20 0 Site-4-001 13m:36s 0 / 38 0 Site-4-002 13m:36s 0 / 40 0 Site-4-003 12m:14s 0 / 34 0 Site-2-001 10m:33s 0 / 18 0 Site-3-001 10m:33s 0 / 24 0 Site-3-002 12m:14s 0 / 12 0 Destination DSA largest delta fails/total %% error Site-1-001 08m:33s 0 / 18 0 Parent-Site-4-001 13m:36s 0 / 20 0 Parent-Site-4-002 08m:11s 0 / 16 0 Parent-Site-4-003 02m:47s 0 / 16 0 Site-4-001 03m:40s 0 / 24 0 Site-4-002 10m:34s 0 / 38 0 Site-4-003 01m:00s 0 / 48 0 Site-2-001 02m:04s 0 / 12 0 Site-3-001 12m:14s 0 / 24 0 Site-3-002 07m:06s 0 / 30 0 Does that look normal? Why 59 minutes delta for DCs in the same site, and less than 15 for remote sites? (that's configurable, I know, but I don't think we did change it. Where can I check the replication schedule?) This was run on the DC Site-4-003, BTW. I think my domain is OK, replication wise. I'm just a bit confused. Any help in clearing my confusion much appreciated.
