[Udpcast] Problem Multicasting Dell GX620s

Todd Deshane deshantm at gmail.com
Wed Jan 10 20:14:14 CET 2007


Hi Jonathan,

One of my favorite tools for debugging network problems is wireshark (used
to be ethereal) http://www.wireshark.org/

Having one or more passive listening computers running wireshark could point
you to potential problems.

Regards,
Todd


On 1/10/07, Jon Miller <jmiller7 at gmail.com> wrote:
>
> Donald,
>
> Thanks for the suggestion, but these are actually desktop machines and
> don't have a wireless card.  I'm starting to think the problem might be with
> the switch, but I'm not sure how to test it.
>
>
> Thanks,
> Jonathan
>
> On 1/10/07, D G Teed <dteed at artistic.ca> wrote:
> >
> >
> > We have D620s from Dell.  I included the wireless support
> > module simply so we could grab the MAC from it for our
> > notebooks database (we run a wget in the busybox shell
> > against a web server CGI to send up this data before imaging).
> >
> > In our case, the Linux kernel was crashing if the wireless
> > antenae was powered on (small switch on side of notebook),
> > so we made sure that switch was off prior to booting
> > the clients.
> >
> > --Donald Teed
> >
> >
> > On Wed, 10 Jan 2007, Jon Miller wrote:
> >
> > > I decided to try this program on a lab of 25 GX620s with SATA drives
> > and
> > > broadcom 57xx gigabit NICs.  I'm not sure why, but when I start a
> > group of
> > > machines the transfer process goes along at a fast pace
> > (~75Mb).  However,
> > > the process always seems to fail at different places during the
> > transfer,
> > > usually at about 800MB to 1.3GB of data.  Sometimes it will recover
> > and
> > > start going again, but usually it just stops and all the clients are
> > > dropped.  I used udp-sender.exe on a Windows machine to transfer a
> > GZIP'd
> > > image created with G4U.  I know the image is good, because I routinely
> > use
> > > it to unicast single PCs.  On the target machines, I used the
> > cast-o-matic
> > > tool and selected all the SATA and NIC modules with Automatic
> > detection.
> > > The machines get an IP address and /dev/sda is detected  Also, I
> > verified
> > > IGMP snooping is enabled on the switch.
> > >
> > > I have tried limiting the --max-bitrate to 40M.  I'm running in
> > 100Mbit mode
> > > --half-duplex (that's how the Summit 400 switch is setup).  I've tried
> > using
> > > the option on cast-o-matic to force IGMPv2 mode, because I'm not sure
> > if our
> > > switch could be the issue.  I also tried the udp-sender program from
> > Ubuntu
> > > (was the version from the default repositories.. might be old).  It
> > had the
> > > same problem as the Win32 version.  Although, the console had a lot
> > more
> > > errors than the windows version... I would get streams of Timeout
> > > notAnswered notReady, etc messages in the console when the process
> > would
> > > halt.  I've also tried setting the SATA mode in the BIOS to
> > Combination.
> > >
> > > Anyone encountered this problem before or have a suggestion?  I'd
> > really
> > > like to use this program, because it seems perfect for my purposes
> > (imaging
> > > labs).
> > >
> > >
> > > Thanks for any help or advise,
> > > Jonathan Miller
> > >
> >
>
>
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