How to setup 1 GBPS link via back-to-back connectivity

[prakasse]

Hi,

We have two HP PARISC servers which are used as RAC nodes. As part of having RAC, there is a private 1 GBPS back-to-back connectivity available (using cross cable, each adapter having the other IP as its gateway).

We did some FTP tests on this network (get/put) of a given file and were surprised to see differing data transfer rates every time we did the test. On further investigation we found auto negotiation enabled at the adapter level, and tried to disable it. However SAM threw an error that 1000 MBPS can be enabled only if auto negotiation is set.

Is it because of any specific reason? How do i get connectivity with highest bandwidth always available.

Thanks in advance,
Senthil.

[Tim Nelson]

try dumping the x-cable and using a 1gb switch

[kevin_m]

I agree that using a switch is the better approach. For one it provides redundancy if you setup other ports for failover. My company is running some older RAC nodes with 1 Gb crossovers though and it works OK. I don't know the results of our speed testing but the DBA's have not raised any complaints. We have the LAN adapters set to auto as that's typical above 100 Mbps.

Kevin