Channel-bonding - choice of switch?

Jeff Largent jlargent at imagelinks.com
Thu Jul 12 11:29:38 EDT 2001


Josip Loncaric wrote:
> 
> Jakob Østergaard wrote:
> >
> > You can buy separate switches, unmanaged dirt cheap ones.
> 
> Sounds reasonable, and if we did use channel bonding, that's what we'd
> do.  This "separate switches" solution results in two identical but
> physicaly separate LANs, which means that you also need a bridge machine

Don't you have this anyway?
lan--gateway--beowulf cluster
       ^
       bridge machine


It's my understanding that channel bonding is an all or none
situation.  You can't have a nonbonded workstation going to one
of the vlans, and then use that workstation to talk to the bonded
cluster nodes.  You lose half a your packets coming back from the
bonded node, so those are retransmitted and half of those are lost
and so on, until eventually you will get all the packets but with
many many retranmissions.




> between channel-bonded nodes and normal machines.  The bridge machine
> can be a bottleneck for applications that need high bandwidth to normal
> machines (data servers, video displays).
> 
> Sincerely,
> Josip
> 
> --
> Dr. Josip Loncaric, Research Fellow               mailto:josip at icase.edu
> ICASE, Mail Stop 132C           PGP key at http://www.icase.edu./~josip/
> NASA Langley Research Center             mailto:j.loncaric at larc.nasa.gov
> Hampton, VA 23681-2199, USA    Tel. +1 757 864-2192  Fax +1 757 864-6134
> 
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-- 
Jeff Largent                   ImageLinks, Inc.
Sr System Admin                Melbourne, Fl 32935
(321) 253-0011                 fax:(321) 253-5559

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