I don't know that much about it, but DFS replication is still using file
block replication not disk level. Also, It may not matter in your
environment but it is recommended that the prestaging folder is 10 times
the largest replicated file (some say 10 times the largest couple files)
to avoid an IO hit.
Is RDC true block-level replication?
No. RDC is a general purpose protocol for compressing file transfer. DFS
Replication uses RDC on blocks at the file level, not at the disk block
level. RDC divides a file into blocks. For each block in a file, it
calculates a signature, which is a small number of bytes that can
represent the larger block. The set of signatures is transferred from
server to client. The client compares the server signatures to its own.
The client then requests the server send only the data for signatures
that are not already on the client.
You might check out:
http://technet.microsoft.com/en-us/library/cc773238%28WS.10%29.aspx
-Original Message-
From: u2-users-boun...@listserver.u2ug.org
[mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Ross Ferris
Sent: Tuesday, June 28, 2011 2:51 AM
To: U2 Users List
Subject: Re: [U2] Windows DFS Replication
I have no direct knowledge, but I suspect that the remote differential
compression used by DFS would need to examine the entire file to
determine changed blocks, and with a non-trivial UV file of a couple of
hundred megs, I imagine that the overhead would be LARGE. However, if
you were looking at this as a periodic update mechanism for a mirrored
server (say, on a nightly basis), rather than attempting real time
database replication changes, you might be in business :-)
All speculation on my part, and happy to defer to someone with firsthand
knowledge, but if you could share an insight to the result you are
trying to achieve, others may be able to provide a more accurate
response.
Ross Ferris
Stamina Software
Visage Better by Design!
-Original Message-
From: u2-users-boun...@listserver.u2ug.org
[mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Jerry Banker
Sent: Tuesday, 28 June 2011 8:04 AM
To: U2 Users Group Technical
Subject: [U2] Windows DFS Replication
Is anyone using Windows DFS Replication with UniVerse on Windows Server
2008?
Jerry
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