[DRBD-user] DRBD with NIC bonding and Crossover cables - no switch

Theophanis Kontogiannis theophanis_kontogiannis at yahoo.gr
Mon Sep 27 09:53:48 CEST 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Bart is correct.

Gbps NICs do NOT need crossover cables to be connected back-to-back 
since they use Auto-MDIX 

Use straight Cat5e or Cat6 Ethernet cables and let the standards do the 
job for you.

This should work like a charm (at least the network/routing/ping thing)

Let us know how it went.


On 01/-10/-28163 09:59 PM, Bart Coninckx wrote:
> On Friday 24 September 2010 23:51:18 Matt Ball, IT Hardware Manager wrote:
>>    I have setup NIC bonding with DRBD successfully but we need to try to
>> reduce the amount of switch ports required as we need to remotely deploy
>> several clusters. We have 2 bonded nics, total of 4 NICs/cables plus one
>> for iLo. So we have 6 that must go into the switch (3 from each cluster)
>> but want to avoid having those additional cables for drbd and that bond
>> going into the switch.
>> We decided to try and connect the drbd resources together using that
>> bond0 channel but using crossover cables instead of going through the
>> switch. No joy. Cannot ping, no communications, destination on trace
>> route shows as the 169.* hardware failure address...
>> We have all GB NICs and the cables are GB crossover.
>> We have tried mode-1, mode-5, and mode-6 which all claim to work without
>> needing special switch configurations.
>> Is there any way to connect a bonded NIC (trunk) and have drbd
>> communicate through it?
>> I apologize in advance if this is not appropriate for the drbd message
>> board, I realize it may be outside the scope of this forum. If so please
>> disregard.
>> _______________________________________________
>> drbd-user mailing list
>> drbd-user at lists.linbit.com
>> http://lists.linbit.com/mailman/listinfo/drbd-user
> We have this running with balance-rr. What is important, is to change tcp-
> reordering, otherwise one gets poor performance. Gigabit does not need
> crossover by the way, maybe that's where things go wrong ...
> B.
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