Layer 4 EtherChannel Load Balancing
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Posted by Nicolai on August 10, 2008, 6:37 am
Please log in for more thread options I do - and I currently have the same problem. I never get over 1Gbit. Will keep an eye on this great post. | ||||||||||||||||
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>
> Server A (TSM client) needs to backup to Server B (TSM server) over
> Ethernet. Server A can have multiple TSM sessions to server B,
> resulting in multiple tape mounts. Furthermore each TSM session
> corresponds to one TCP session.
> Server A and Server B both have a layer 4 EtherChannel defined of 4
> interfaces in which the hashing is based on source and destination
> ports.
> So this means that, whenever Server A starts 2 TSM sessions to Server
> B (= 2 TCP sessions resulting in 2 tape mounts), the EtherChannel on
> server A will balance the load on two switchports (given the used
> hashing algorithm). Unfortunately, since my 3750E only allows layer 2
> and layer 3 EtherChannel load balancing, all load will be placed on
> the same physical port of server B's EtherChannel, only resulting in a
> maximum throughput of only 1 Gbit/s for server A. Ofcourse, whenever
> another server (f.e. server C) starts a TCP session with server B, it
> is likely (75% chance) that it will use another port of Server B's
> EtherChannel...
> Bottom line is that Server A will never get a bandwidth higher than 1
> Gbit/s no matter how many TCP sessions is starts with Server B.
>
> Do you understand the problem?