[ewg] IB HA mode bonding over SDP

[bhavinkumar thumar]

Hi Richard,

Thanks a lot for replying.

ok, so you mean that OFED doesn't support failover for SDP and one can
modify or add some code in OFED for failover support over SDP, right? then,
Will you please give me some initial pointers through which I can start
looking at OFED source code for adding failover support to SDP? It would be
of great help.


Thanks,
Bhavin

On Mon, Mar 21, 2011 at 12:55 PM, Richard Croucher <
richard at informatix-sol.com> wrote:

> The bonding driver only works for IPoIB.   If  you are have writing you own
> VERBS program then you can use Automatic Path Migration (APM) but this does
> require not insignificant coding.
>
>
>
> Currently SDP, RDS, SDR, iSER don’t include any failover.   Some, such as
> SDP and iSER at least, use IPoIB as a namespace; using it to identify the
> end-points with the familiar IPv4 naming tools.  The currently active link
> from the IPoIB bonded pair will therefore be used for this naming unless you
> specifically use the non-bonded IP addresses to identify the interface.
>
>
>
> Failover is not such as issue for the storage protocols, since most
> platforms already have solutions for channel failover for block storage
> devices.  On Solaris, I used MPxIO successfully over SRP.
>
>
>
> Whilst SDP does not currently include APM support it will automatically
> fall back to IPoIB in the event of a problem.
>
>
>
> APM is relatively new to OFED.   I know of a number of VERBS programs which
> have specifically coded it in.
>
> So the bottom line is that OFED provides the capability, but it is up to
> the ULP protocol to decide if to use it and to then add the necessary code.
>
>
>
> Richard
>
>
>
>
>
> *From:* ewg-bounces at lists.openfabrics.org [mailto:
> ewg-bounces at lists.openfabrics.org] *On Behalf Of *bhavinkumar thumar
> *Sent:* 18 March 2011 09:11
> *To:* ewg at lists.openfabrics.org
> *Subject:* [ewg] IB HA mode bonding over SDP
>
>
>
> Hi All,
>
> I am a newbie in infiniband domain. I am trying to use IB over SDP instead
> of IPOIB. My problem is I have got 2 Mallenox IB cards on a machine so I
> created a bonding using ib-bonding driver. I have installed OFED 1.5.2. But
> with this bonding, connection is getting disconnected whenever link failure
> occurs.
>
> Is there any solution to this problem? I look around the web for the same
> and I found that the HW failure would cause the IB RC session of a native IB
> ULPs (SDP, RDS, iSER, Lustre, rNFS) to break, but I haven't found any
> solution for this. Do I need to change anything in OFED?
>
> Please help.
>
> Thanks & Regards,
> Bhavin
>
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