[DRBD-user] bond for drbd identical performance with one link down

Bart Coninckx bart.coninckx at telenet.be
Tue May 25 15:09:08 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.

On Tuesday 25 May 2010 15:06:43 Bart Coninckx wrote:
> On Thursday 20 May 2010 21:57:43 Ben Timby wrote:
> > On Thu, May 20, 2010 at 3:52 PM, Bart Coninckx <bart.coninckx at telenet.be>
> wrote:
> > > Since testing with a switch resulted in even poorer results, I'll shy
> > > away from that for now. Will have a go at investigating with Wireshark
> > > though seeing the problem will probably not indicate a solution right
> > > of the bat.
> >
> > Identifying the problem is half the solution. Good luck!
> Hi all,
> thought I'd report back about the issue. I didn't get round to sniffing and
> analyzing the traffic, but I did try to change the value of
> /proc/sys/net/ipv4/tcp_reordering to 127.
> This seemed to boost things by 50% and I ended up at about 180 MB/sec,
>  which I understand is a to be expected value.
> Results seemed only to be consisted after restart the bond0 driver after
> changing tcp_reordering though.
> Glad I finally tackled this one.
> Cheers for your help,
> Bart
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What still is an issue though, is the fact that if I take out a networkcable 
longer than 5 seconds, it will not go up again after reconnecting the cable.

I  don't have this problem with a switch, so I guess that both interfaces are 
disabled and do not send electrical signals over the wire which could 
encourage the other interface to wake up again.

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