Turns out it was simple. As usual, I was wrong about some of my assumptions. Turns out, my boss *did* make changes to the replication schedule. In Sites and Services, any "automatically generated" links have the (default?) schedule of 60 minutes. Any manually added servers (apparently manually added server connections to the NTDS settings, effectively so that every DC has a connection to every other DC. And these manual connections are set for replication 4x per hour.
That accounts for the time differentials I am seeing, and so I won't have to worry about replication. I probably should change all those links to be 4x per hour. I think they may have been changed a long while ago, when we had slower (and less reliable) links between sites. Now all my links are 1G or higher, and extremely reliable, so 4x an hour wouldn't swamp the link (we don't generate THAT much AD traffic ...). So one worry down. Now to check dcdiag, to prepare for the Win2012 R2 AD upgrade ... On Tue, Sep 16, 2014 at 10:18 AM, Michael Leone <[email protected]> wrote: > 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. >
