I'd like to second the comments by Hans --

Windows servers can perform well -- assuming the infrastructure is there to
support it.

Our TSM server is running 6.2 on a 64-bit Windows 2003 Server.  One 1Gb
ethernet nic.
Our datamover/proxy is running 6.3 client on a Windows 2008 R2 (64-bit)
Server.  One 1Gb ethernet nic.

We are regularly able to stream image backups at 500Mbps (that's
megabits-per-second, just to be clear), reading from 4Gb fibre-channel and
dumping across a dedicated LAN connection to the TSM server.  Sometimes
sending for 15-30 seconds at 700-750Mbps, topping out at around 815Mbps.  I
can run two proxies simultaneously streaming, and the TSM server will be
receiving data from multiple image backups at a sustained rate of
~700-750Mbps.

Incremental, file-level backups are another story... searching 6 Million
files in 4TB and backing up <50GB can take ~2 hours.

I would love to see what I can do with 10Gb ethernet, but we're not there
yet...

Mike

On Wed, Feb 12, 2014 at 2:13 PM, Schaub, Steve <Steve_Schaub AT bcbst DOT 
com>wrote:

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf 
> Of
> Hans Christian Riksheim
> Sent: Monday, February 10, 2014 9:04 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: [ADSM-L] Exchange 2010 backup performance
>
> In my experience there is nothing wrong with the TCP stack in Windows.
> Especially Windows2008R2 performs very well. For a single stream from a
> 2008R2 client (dsm sel <big file of zeroes>) to an AIX TSM-server 500km
> away over 10Gig directly to LTO5 has a speed of around 200MB/ at our setup.
> Bottleneck being the drive.
>
> After too much experimenting I have found the critical factor to be to set
> TCPWINDOWSIZE 0 at both dsm.opt and dsmserv.opt and increase the tcp-sizes
> in AIX(and override the tcp-settings on the NIC). Windows OS can be left
> alone as its default is quite OK. YMMV of course.
>
> Regards,
>
> Hans Chr.
>



Best regards,

Mike
RMD IT, x7942