I'm not quite sure why IBM recommend such a drastic measure and also not very professional in my opinion. Well if IBM are unwilling to help you diagnose this issue, hopefully I can help. Could you post the tests you are trying, NICs being used, speed/duplex settings, jumbo/standard frame sizes etc?
Have a look at the RMON statistics entry for the switches to see if you are reporting any errors, particularly collisions for the server ports.
If so, go and have a look at the port configuration page, for the port(s) in question; if you are seeing collisions, then you will probably see that the port is running in half duplex.
This can cause significant packet loss.
Best practice for server connections is to fix both ends ; if you fix to a gig, then thats FD by default, if you fix at 100, then specify FD - you must fix both ends.
If you see other error types, then post the info back here.
I have been monitoring RMON for several weeks and have not seen any data loss. IBM 4690 supports only 10/100 and Half-Duplex. I thought 2724 are auto-sensing and can have half-duplex. Is there a way to change port setting to 10/100 and half-duplex? I spent over $1,300 on these switches and had to dump it.
When using Auto-Negotiation, both ends of the connection should be set to Auto. If not then both ends should be hard set. From the web interface choose 'interface configuration', select the port which has the IBM attached. Disable Auto-Negotiation and choose the desired speed and duplex setting.
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