[Users] Weird IPoIB issue

Mon Oct 28 10:28:16 PDT 2013

Well, that can explain why I'm only able to get 10 Gbps max from the two
hosts that are working.

I have tried updn and dnup and they didn't help either. I think the only
thing that will help is Automatic Path Migration is it tries very hard to
route the alternative LIDs through different systemguids. I suspect it
would require re-LIDing everything which would mean an outage. I'm still
trying to get answers from Oracle if that is even a possibility. I've tried
seeding some of the algorithms with information like root nodes, etc, but
none of them worked better.

The MLID 0xc000 exists and I can see all the nodes joined to the group
using saquery. I've checked the route using ibtracert specifying the MLID.
The only thing I'm not sure how to check is the group parameters. What tool
would I use for that?

Thanks,

Robert LeBlanc
OIT Infrastructure & Virtualization Engineer
Brigham Young University

On Mon, Oct 28, 2013 at 11:16 AM, Hal Rosenstock
<hal.rosenstock at gmail.com>wrote:

> Xsigo's SM is not "straight" OpenSM. They have some proprietary
> enhancements and it may be based on old vintage of OpenSM. You will likely
> need to work with them/Oracle now on issues.
>
> Lack of a partitions file does mean default partition and default rate (10
> Gbps) so from what I saw all ports had sufficient rate to join MC group.
>
> There are certain topology requirements for running various routing
> algorithms. Did you try updn or dnup ?
>
> The key is determining whether the IPoIB broadcast group is setup
> correctly. What MLID is the group built on (usually 0xc000) ? What are the
> group parameters (rate, MTU) ? Are all members that are running IPoIB
> joined ? Is the group routed to all such members ? There are
> infiniband-diags for all of this.
>
>
> On Mon, Oct 28, 2013 at 12:19 PM, Robert LeBlanc <robert_leblanc at byu.edu>wrote:
>
>> OpenSM (the SM runs on Xsigo so they manage it) is using minhop. I've
>> loaded the ibnetdiscover output into ibsim and run all the different
>> routing algorithms against it with and without scatter ports. Minhop had
>> 50% of our hosts running all paths through a single IS5030 switch (at least
>> the LIDs we need which represent Ethernet and Fibre Channel cards the hosts
>> should communicate with). Ftree, dor, and dfsssp failed back to minhop, the
>> others routed more paths through the same IS5030 in some cases increasing
>> our host count with single point of failure to 75%.
>>
>> As far as I can tell there is no partitions.conf file so I assume we are
>> using the default partition. There is an opensm.opts file, but it only
>> specifies logging information.
>> # SA database file name
>> sa_db_file /var/log/opensm-sa.dump
>>
>> # If TRUE causes OpenSM to dump SA database at the end of
>> # every light sweep, regardless of the verbosity level
>> sa_db_dump TRUE
>>
>> # The directory to hold the file OpenSM dumps
>> dump_files_dir /var/log/
>>
>> The SM node is:
>> xsigoa:/opt/xsigo/xsigos/current/ofed/etc# ibaddr
>> GID fe80::13:9702:100:979 LID start 0x1 end 0x1
>>
>> We do have Switch-X in two of the Dell m1000e chassis but the cards,
>> ports 17-32, are FDR10 (the switch may be straight FDR, but I'm not 100%
>> sure). The IS5030 are QDR which the Switch-X are connected to, the switches
>> in the Xsigo directors are QDR, but the Ethernet and Fibre Channel cards
>> are DDR. The DDR cards will not be running IPoIB (at least to my knowledge
>> they don't have the ability), only the hosts should be leveraging IPoIB. I
>> hope that clears up some of your questions. If you have more, I will try to
>> answer them.
>>
>>
>>
>>
>> Robert LeBlanc
>> OIT Infrastructure & Virtualization Engineer
>> Brigham Young University
>>
>>
>> On Mon, Oct 28, 2013 at 9:57 AM, Hal Rosenstock <hal.rosenstock at gmail.com
>> > wrote:
>>
>>> What routing algorithm is configured in OpenSM ? What does your
>>> partitions.conf file look like ? Which node is your OpenSM ?
>>>
>>> Also, I only see QDR and DDR links although you have Switch-X so I
>>> assume all FDR ports are connected to slower (QDR) devices. I don't see any
>>> FDR-10 ports but maybe they're also connected to QDR ports so show up as
>>> QDR in the topology.
>>>
>>> There are DDR CAs in Xsigo box but not sure whether or not they run
>>> IPoIB.
>>>
>>> -- Hal
>>>
>>>
>>> On Sun, Oct 27, 2013 at 9:46 PM, Robert LeBlanc <robert_leblanc at byu.edu>wrote:
>>>
>>>> Since you guys are amazingly helpful, I thought I would pick your
>>>> brains in a new problem.
>>>>
>>>> We have two Xsigo directors cross connected to four Mellanox IS5030
>>>> switches. Connected to those we have four Dell m1000e chassis each with two
>>>> IB switches (two chassis have QDR and two have FDR10). We have 9 dual-port
>>>> rack servers connected to the IS5030 switches. For testing purposes we have
>>>> an additional Dell m1000e QDR chassis connected to one Xsigo director and
>>>> two dual-port FDR10 rack servers connected to the other Xsigo director.
>>>>
>>>> I can get IPoIB to work between the two test rack servers connected to
>>>> the one Xsigo director. But I can not get IPoIB to work between any blades
>>>> either right next to each other or to the working rack servers. I'm using
>>>> the same exact live CentOS ISO on all four servers. I've checked opensm and
>>>> the blades have joined the multicast group 0xc000 properly. tcpdump
>>>> basically says that traffic is not leaving the blades. tcpdump also shows
>>>> no traffic entering the blades from the rack servers. An ibtracert using
>>>> 0xc000 mlid shows that routing exists between hosts.
>>>>
>>>> I've read about MulticastFDBTop=0xBFFF but I don't know how to set it
>>>> and I doubt it would have been set by default.
>>>>
>>>> Anyone have some ideas on troubleshooting steps to try? I think Google
>>>> is tired of me asking questions about it.
>>>>
>>>> Thanks,
>>>>
>>>> Robert LeBlanc
>>>> OIT Infrastructure & Virtualization Engineer
>>>> Brigham Young University
>>>>
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at lists.openfabrics.org
>>>> http://lists.openfabrics.org/cgi-bin/mailman/listinfo/users
>>>>
>>>>
>>>
>>
>
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