Solved the issue by moving the content lib off the c drive where it had 
“decided” to go.
Still having a slowdown and eventually death of the multicast transmission if 
too many client join at the same time. I may have to look at scheduled cast.

Does anybody know if anything switch config wise would cause this?

From: Matt Wilkinson [mailto:[email protected]]
Sent: 06 August 2014 08:29
To: [email protected]
Subject: RE: [MDT-OSD] SCCM 2012 R2 CU2 Multicast

Ok it’s not a bad image.
Any image the is distributed and has the multicast enabled since the CU2 
upgrade fails to deploy. I get the infamous hash error.

Installation of image 1 in package <package> failed to complete..
The hash value is not correct. (Error: 80091007; Source: Windows)            
ApplyOperatingSystem 05/08/2014 12:41:03        1632 (0x0660)

Further up the log it appears I get an error 3.

Encountered error transfering file (0x80070003).               
ApplyOperatingSystem 05/08/2014 12:41:03        1632 (0x0660)


Anybody had a similar issue?

Do I need to remove the tick for multicast across all images remove the 
multicast role on the DP and re-enable then tick the multicast option for each 
image?
From: Matt Wilkinson [mailto:[email protected]]
Sent: 01 August 2014 10:24
To: [email protected]<mailto:[email protected]>
Subject: RE: [MDT-OSD] SCCM 2012 R2 CU2 Multicast

Thanks for all the help. Looks like a bad image. Out of curiosity what’s the 
largest image people have deployed using multicast? This one is 13GB.

From: Matt Wilkinson [mailto:[email protected]]
Sent: 30 July 2014 08:39
To: [email protected]<mailto:[email protected]>
Subject: RE: [MDT-OSD] SCCM 2012 R2 CU2 Multicast

After a bit of testing it appears the transmission drops as a client joins the 
stream. Is this normal? If too many clients join in close succession the speed 
is extremely slow. Network utilisation falls to 0.01% rather than the usual 70% 
.

From: the codepoets [mailto:[email protected]]
Sent: 29 July 2014 16:23
To: [email protected]<mailto:[email protected]>
Subject: Re: [MDT-OSD] SCCM 2012 R2 CU2 Multicast

I do not use multicast in my SCCM environment, but I remember seeing this when 
CU2 came out... perhaps you are dealing with what is being blogged about?

http://thoughtsonopsmgr.blogspot.com/2014/07/ur2-sccm-2012-r2-breaks-mulitcast-again.html

On Tue, Jul 29, 2014 at 8:08 AM, elsalvoz 
<[email protected]<mailto:[email protected]>> wrote:
Multicast is not a SCCM technology per se, it can use that protocol to deliver 
images though. This behavior points to unicast being used or network 
configuration in your environment have changed as well.

On Tue, Jul 29, 2014 at 7:48 AM, Matt Wilkinson 
<[email protected]<mailto:[email protected]>> wrote:
Anybody had any issues? Before CU2 we could have 40 clients downloading an 
image. Multicast seems to grind to a halt when 30 or more clients join the 
transmission.

Matt Wilkinson
IT Technician
Leeds College of Building


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