Is DFS Initial Sync actually getting anywhere?

Hi,
The other day i had to recreate our DFS name space and replication. One of the servers is running an initial sync and has been for around a week and a half. How long is this supposed to take? Its 2tb over a 10mbps leased line so not that
fast, but it still seems like a very long time.
Is there anyway to see how far its got? if its actually progressing at least would take a load off my mind.
Thanks for the help.
David
2TB over 10 Mbps?! That's insane! Use seeding for DFS to save time & money. See:
DFS Seeding with Robocopy
http://technet.microsoft.com/en-us/library/dn495044.aspx
Good luck!
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

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DFS initial sync slow-down

We are setting up 3 replication groups, 1 which we are able to do over the LAN and the other 2 which need to be performed over the WAN (10mb IPSec VPN at each site).
The local data set which is 2TB replicated fine in about 2 days.
The 2 WAN data sets have exhibited strange behaviour. They start off quick, then basically hit a block and continue to replicate but very slowly (500mb-1gb/day).
The first one got up to 220gb, then slowed right down. The second one got up to 45gb, then slowed right down.
Hub: Server 2008 R2
Client: Server 2012 R2
The staging quota should be OK as I am not getting any errors in the DFSR log about hitting the high watermark.
If I look at the logs in C:\Windows\debug I constantly see this error:
+ [Error:9027(0x2343) Meet::InstallStep meet.cpp:1879 12296 C A failure was reported by the remote partner]
+ [Error:9027(0x2343) Meet::Download meet.cpp:2296 12296 C A failure was reported by the remote partner]
+ [Error:9027(0x2343) InConnection::TransportRdcGet inconnection.cpp:4423 12296 C A failure was reported by the remote partner]
+ [Error:9027(0x2343) DownstreamTransport::RdcGet downstreamtransport.cpp:5265 12296 C A failure was reported by the remote partner]
+ [Error:9027(0x2343) RpcFinalizeContext downstreamtransport.cpp:1147 12296 C A failure was reported by the remote partner]
+ [Error:9027(0x2343) DownstreamTransport::RdcGet downstreamtransport.cpp:5192 12296 C A failure was reported by the remote partner]
+ [Error:9078(0x2376) DownstreamTransport::RdcGet downstreamtransport.cpp:5192 12296 C All server file transfer contexts are currently busy]
I have had a look through http://blogs.technet.com/b/askds/archive/2007/10/05/top-10-common-causes-of-slow-replication-with-dfsr.aspx however
none of the points seem to apply.
I've noted this solution also, that also suggests possible VPN issues http://social.technet.microsoft.com/Forums/windowsserver/en-US/eeaa60c7-0480-4ae9-b367-4cb9676fabd0/dfsr-event-5014-dfs-replication-service-is-stopping-communication?forum=winserverDS -
I know it references Meraki's VPN setup (which funnily enough we are moving to shortly, but we're just using Cisco IPSec VPN right now via Cisco Routers), but perhaps that may also have some sort of idea as to what the issue may be?
I'm inclined to think though it's definitely something relating to RPC (happy to be proven wrong though!) as if I copy the same data over the WAN using robocopy or even Explorer, it can do 550gb no problems in 3 days.

Hi,
Please test to create a new replication group, create small files in folder and waiting for the initial replication to be finished.
Once it finished, try to put a large file which need to be replicated and see if it will still stopped in several GB.
Meanwhile please understand that generally we recommended to do a pre-staging with robocopy or backup-restore instead of waiting for the initial replication.
If you have any feedback on our support, please send to [email protected]

Dfs initial replication

Hi,
I was wondering whether you can allow users to access the target of an initial replication while the replication is still going. If so, how will dfs cope with changes and deletions on that share? Will it use USNJournal? What's the risk of
a journal wrap destroying data if a lot of changes are made while initial replication is running?
Also, if something should go wrong with that initial replication how would one recover from that failure? I assume just rebuilding the replication group will make a huge mess in such case?
Thanks in advance for your response!
S.
MCP/MCSA/MCTS/MCITP

You might find this helpful:
http://blogs.technet.com/b/askds/archive/2007/10/05/top-10-common-causes-of-slow-replication-with-dfsr.aspx?PageIndex=15
As Ned says in #10, it's ideal to perform initial sync during a change window. As they files are changed it will likely only lead to a larger replication backlog, however the changes will be kept track of in the change journal. If initial sync
never really makes it over the mountain you may just need to increase the staging area:
http://blogs.technet.com/b/askds/archive/2011/07/13/how-to-determine-the-minimum-staging-area-dfsr-needs-for-a-replicated-folder.aspx
However, in a perfect world if we're talking about synching a lot of data it's always best to pre-seed the data from Node1 to Node2 with Robocopy or Windows Server Backup. Here's the case for pre-seeding versus not:
http://blogs.technet.com/b/askds/archive/2008/02/12/get-out-and-push-getting-the-most-out-of-dfsr-pre-staging.aspx
If, as you say, initial replication never seems to make it over the hump and adjustments to the staging area don't help, you might consider stopping replication and pre-seeding the data. This means the replication service will have less to do because
you've done all the work up front with robocopy or Windows Server Backu:.
http://blogs.technet.com/b/askds/archive/2010/09/07/replacing-dfsr-member-hardware-or-os-part-2-pre-seeding.aspx
Hope this helps clear things up a bit.

DFSR Errors and Initial Sync slows down Network

Hello
I have a Windows 2012 Server (primary member-site A) where i created one Replication Group which replicates one folder with the amount of 104 GB of Data over WAN to another Windows 2012 Server (site B)
I added the Namespace-Server, created the Replication Group with 24 GB Staging quota and now it's waiting for the initial sync which slows down my network on the primary member site badly. Ping-timeouts, 6 times slower ping, i almost can not work remote.
It created the folder structure on site B, ~4GB.
If i stop the DFS-Replication service, network traffic is normal again. I also get a couple of errors in event viewer:
DFSR ID 5012 error 9026
DFSR ID 5014 error 9033
Anybody got an idea? Thanks

Hi,
Sorry for the delay in reply.
Robocopy is sometimes recommended to customers as well as Backup-Restore. For DFS initial replication, the important part is to get most files ready in the other side - it is fine to level some difference such as permission, newly updated files etc. These
difference will be updated soon with finishing initial replication.
Hope the issue was already fixed in these days!
If you have any feedback on our support, please send to [email protected]

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Forgot about getting this problem solved.
The user account that had this trouble had a copy of his home directory from a laptop in his home directory. This backup had it's own Library folder which was confusing the Mobile account sync process.
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Here are all the details that may be needed to assist with this question (and thank you!)
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Hi guys, the basic summary is that after upgrading from a mobile me account to icloud (using a me.com account), I was able to sync everything from Outlook to the customer's iPhone but anything created after that would not sync. I tried creating a contact, calendar item, and other calendar items, none of which showed up either way (outlook to phone and vice versa).
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Deleted Item not actually getting deleted or **delay** deleted thus getting refetched (EWS Managed API)

I am polling Exchange Server to fetch all the mails left in the Inbox and then fetching them, processing them and finally moving them to the deleted folder. My procedure takes following form of EWS Managed API calls:
1 itemResults = service.FindItems(WellKnownFolderName.Inbox, itemView);
2 //some code...
3 service.LoadPropertiesForItems(itemResults.Items, itItemPropSet);
4 //some code...
5 foreach(Item item in itemResults)
6 {
7 //process item
8 item.Delete(DeleteMode.MoveToDeletedItems);
9 }
To test this code I flooded the inbox with 5000 mails, 5 threads flooding 1000 mails each at the interval of 4ms.
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<m:FindItemResponse>...</m:FindItemResponse> //generated by line 1
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<m:DeleteItemRepsonse>...</m:DeleteItemRepsonse> //generated by line 8
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<m:FindItemResponse>100 items</m:FindItemResponse>
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<m:FindItem>100 items</m:FindItem>
<m:FindItemResponse>100 items</m:FindItemResponse>
<m:GetItem>100 items</m:GetItem>
<m:GetItemResponse>35 items</m:GetItemResponse>
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<m:FindItem>100 items</m:FindItem>
<m:FindItemResponse>100 items</m:FindItemResponse>
<m:GetItem>100 items</m:GetItem>
<m:GetItemResponse>100 items</m:GetItemResponse>
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<m:FindItemResponse>35 items</m:FindItemResponse>
<m:GetItem>35 items</m:GetItem>
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First thing I realize dispatching SOAP packets in burst of 100s is EWS Managed API behavior. I guess there must be traffic reason behind it and there must be some configuration setting to tweak it.
Q1. How can we change this count of 100?
I inferred that there are some overlaps in fetching of mails.
So I copy pasted SOAP Traces for first two of
<m:GetItem>100 items</m:GetItem>
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I am polling Exchange Server to fetch all the mails left in the Inbox and then fetching them, processing them and finally moving them to the deleted folder. My procedure takes following form of EWS Managed API calls:
1 itemResults = service.FindItems(WellKnownFolderName.Inbox, itemView);
2 //some code...
3 service.LoadPropertiesForItems(itemResults.Items, itItemPropSet);
4 //some code...
5 foreach(Item item in itemResults)
6 {
7 //process item
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9 }
To test this code I flooded the inbox with 5000 mails, 5 threads flooding 1000 mails each at the interval of 4ms.
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When I read the soap traces logged using TraceListener, I realized that when there are more than 100 mails in the inbox, there are more SOAP packets were dispatched in burst of 100s.
Logically below set of SOAP Packets (let us call it "Set 1") should occur only once:
<m:FindItem>...</m:FindItem> //generated by line 1
<m:FindItemResponse>...</m:FindItemResponse> //generated by line 1
<m:GetItem>...</m:GetItem> //generated by line 3
<m:GetItemResponse>...</m:GetItemResponse> //generated by line 3
followed x number of Delete SOAP packets for x number of mails in the Inbox
<m:DeleteItem>...</m:DeleteItem> //generated by line 8
<m:DeleteItemRepsonse>...</m:DeleteItemRepsonse> //generated by line 8
However if there are say 325 mails in the inbox, then there first occurs 4 occurences of Set 1 followed by Delete SOAP packest as follows:
//1st occurence
<m:FindItem>100 items</m:FindItem>
<m:FindItemResponse>100 items</m:FindItemResponse>
<m:GetItem>100 items</m:GetItem>
<m:GetItemResponse>35 items</m:GetItemResponse>
//2nd occurence
<m:FindItem>100 items</m:FindItem>
<m:FindItemResponse>100 items</m:FindItemResponse>
<m:GetItem>100 items</m:GetItem>
<m:GetItemResponse>35 items</m:GetItemResponse>
//3rd occurence
<m:FindItem>100 items</m:FindItem>
<m:FindItemResponse>100 items</m:FindItemResponse>
<m:GetItem>100 items</m:GetItem>
<m:GetItemResponse>100 items</m:GetItemResponse>
//4th occurence
<m:FindItem>35 items</m:FindItem>
<m:FindItemResponse>35 items</m:FindItemResponse>
<m:GetItem>35 items</m:GetItem>
<m:GetItemResponse>35 items</m:GetItemResponse> //****followed by 335 occurences of the Delete SOAP packets****<m:DeleteItem>...</m:DeleteItem>
<m:DeleteItemRepsonse>...</m:DeleteItemRepsonse>
//334 more of above
So there are 100 + 100 + 100 + 35 = 335 items actually getting handled, which is 10 more than what are actually present in the inbox.
Also notice that Delete SOAP packets are queued till end. They are not dispatched in burst.
First thing I realize dispatching SOAP packets in burst of 100s is EWS Managed API behavior. I guess there must be traffic reason behind it and there must be some configuration setting to tweak it.
Q1. How can we change this count of 100?
I inferred that there are some overlaps in fetching of mails.
So I copy pasted SOAP Traces for first two of
<m:GetItem>100 items</m:GetItem>
in two different files, and compared them in text comparer. I realised that some mails that are at the end of the first 100s were reappearing at the beginning of 2nd 100:
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So I guess there is time delay in delete mail API call and mails actually getting deleted, between which they are getting refetched.
Q2. How can I handle this to avoid redundant processing of mails and unnecessary exceptions.

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Just the other day a problem developed. When I sync my iPod (160G,) after a short time of syncing I get a pop-up which says, "Cannot sync "Dennis iPod" because an unknown error occurred. Error number 48"
I clicked OK, and it seemed to sync anyway without further problems. Now this may be a separate issue, but yesterday I was trying to help a friend with loading iTunes on his computer and then getting music in it and then syncing his new Nano. He knows less about computers than I do, so I went through all the steps in detail, clicking on various settings, etc.
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Is DFS Initial Sync actually getting anywhere?

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