[ofa-general] RE: IPoIB bonding document ?

[Tang, Changqing]

Or:
	the doc is too short, I hope to get some technical details.
Suppose "ib-bond --bond-ip 192.186.10.100 --slaves ib0,ib2"
during regular operation time, only ib0 has traffic, ib2 is NOT used,
right ?

	When ib0 fails, TCP fail-over to ib2. Then ib0 is
repaired(replace a cable/switch, for example). Later when ib2 fails,
can TCP fail-over back to ib0 again ?


--CQ 

> -----Original Message-----
> From: Or Gerlitz [mailto:ogerlitz at voltaire.com] 
> Sent: Wednesday, April 18, 2007 1:59 AM
> To: Tang, Changqing
> Cc: OpenFabrics General; Moni Shoua
> Subject: Re: IPoIB bonding document ?
> 
> Tang, Changqing wrote:
> > I know you are working on bonding, where is a good document about 
> > IPoIB bonding ?
> > I have a few questions:
> > 
> > 1. is bonding working on two HCAs, as well as two ports on 
> th same HCA ?
> > 2. is the second channel idle, or two channels are used 
> during regular 
> > time ?
> 
> Hi CQ - I am cc-ing the general list as well, as other people 
> might be interested as well.
> 
> The package provided with OFED 1.2 contains documentation, 
> you can browse to the below url to get the doc.
> http://www.openfabrics.org/git/?p=~monis/ofed-bond-pkg.git;a=t
> ree;f=ib-bonding-0.9.0/docs;h=ea30b3e6e8ebe530182cff18e8e7db19
> ee4aa346;hb=HEAD
> 
> Bonding works in the interface level such that a bonding 
> master interface (eg bond0) enslaves other interfaces (eg ib0 
> and ib1). In the IPoIB case, the enslaved devices can be 
> bounded to two (or more) ports on the same/different HCA, its 
> also possible to bond child interfaces (eg ib0.8003 and ib1.8003) etc.
> 
> The bonding driver has one HA and few LB operation modes, 
> currently, only the HA mode (named Active-Backup) is 
> supported for IPoIB.
> 
> > 3. the mesage re-transmit from first channel to second 
> channel at TCP 
> > packet level, right ?
> 
> I am not sure to follow you, in case you ask if after bonding 
> fail-over TCP re-transmission is done over the active 
> interface used by bonding, the answer is yes.
> 
> Or.
> 
> 
> 
> 
>