[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 ?
> Right

What is the definition of ib0, ib1 ? 

Are these the IB device returned by ibv_devinfo command and in that
order ?
I was learned a while back that ibv_get_debvice_list() does not return
consistent results.

Or are these the IPoIB interfaces ? then the bond-ip must be different
from these two IPs, right ?
then question is, can I use all the three IPs in the same time ?



> > 
> > 	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 ?
> Yes.


When TCP tries to fail-back to ib0, does it need to know that ib0 is
back online again, and how does it know ?
If TCP just blindly fail-over from one interface to another, what happen
if both interfaces are bad ?


Thanks.
--CQ


> > 
> > 
> > --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.
> >>
> >>
> >>
> >>
> >>
> 
> 
>