[Beowulf] Anyone have experience with Cisco 6509 switches for a cluster?
landman at scalableinformatics.com
Wed Jun 15 07:27:01 PDT 2011
A partner is rebuilding a beowulf rendering/post-production cluster,
and they swapped out some smaller switches for a larger Cisco 6509
switch frame. They are encountering some issues, asked us for help.
Unfortunately, I know very little about these switches and IOS (not the
Apple bit), so I am hoping to get a pointer to what we should be looking
for. If anyone is an IOS/Cisco expert that can help today, please
contact me offlist.
Here's the problem:
iperf between 2 nodes, wire speed. 117 MB/s.
iperf between 4 nodes, 1/2 wire speed, or 55 MB/s.
As they increase the number of pairs doing iperf, performance keeps
This suggests that all traffic is being serialized somehow, possibly
transiting a single interface.
Anyone out there ever see something like this before? Any clues as
to how to handle it? Or how to diagnose/fix this?
Thanks in advance.
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
email: landman at scalableinformatics.com
web : http://scalableinformatics.com
phone: +1 734 786 8423 x121
fax : +1 866 888 3112
cell : +1 734 612 4615
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