ISCSI LUNs not reachable after Lan Card set to 100FD

[rick jones]

I thought the NIC was 1000BT? What do ioscan -fk -C lan show? (Might as well include lanscan output as well)

[Bill Hassell]

For 100 Mbit NICs using a National Semiconductor chip, the length of the LAN cable (35 to 41 meters) can cause auto-negotiation to fail. The length causes the auto-negotiation to fail and the link falls back to 100 half-duplex, the industry standard. That in turn causes the massive errors you are seeing and the very slow throughput (about 5% of normal speed).

Assuming that the cable is really CAT-5e or better, and that the switch is set to auto, then the fix is to lengthen (or shorten) the cable by 10 meters.

[Lucy2009_1]

Ok problem solved by moving to Gb switch and set both system and switch port to autoneg. I have two systems, one is 10/100 Base-T and other is 1Gb nic. Both came up to full duplex and iscsi luns were mounted!

Thanks all for your input! Great Forum!