[ofa-general] ofed 1.3.2 opensmd failover

[PN]

2009/8/26 Hal Rosenstock <hal.rosenstock at gmail.com>

>
>
> On 8/25/09, PN <poknam at gmail.com> wrote:
>>
>> HI,
>>
>> I can think of a situation in which all servers have dual port IB cards
>> and need failover of OpenSM to achieve HA.
>> As I know, OpenSM can only bind to 1 port at a time,
>
>
> Yes.
>
>  so do I need to start 2 OpenSM in server A and 2 OpenSM in server B?
>
>
> That would be one valid configuration. I'm assuming all ports are connected
> to same subnet.
>

In some cases, I will use IB bonding. While in another cases, I may use 1
port for calculation and another port to connect the storage.
I'm not sure which configuration will provide better performance.


> Will they use the same guid2lid file?
>
>
> Depends how the OpenSM configuration is done.
>
>  Do I need to set something in the config file or they will automatically
>> communcate each other?
>
>
> What communication are you referring to ? The all need to share the same
> subnet prefix.
>

I mean the handover mechanism. I remember in the previous OpenSM config file
(in OFED 1.2.x/1.3.x), there is a field about all the subnet manager in the
subnet, but this field is omitted in the new version. I wonder whether all
the OpenSM will automatically discover each other and do the handover
mechanism right.

Thanks.

PN


>
>
>
>> Do I need to run sldd.sh manually or it will automatically sync with other
>> OpenSM?
>
>
> You can either manually copy the guid2lid file around to the appropriate
> places. I'm not that familiar with sldd.sh but I think it can either be run
> manually or made to run automatically but I'm not familiar with the details.
>
> -- Hal
>
>
> Thanks a lot.
>>
>> Regards,
>> PN
>>
>>
>>
>>
>> 2009/8/26 Hal Rosenstock <hal.rosenstock at gmail.com>
>>
>>>
>>>
>>>  On 8/25/09, kovlensky at interia.pl <kovlensky at interia.pl> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> Quick question - is there a need to run anything except opensmd deamons
>>>> to provide failover capability on ib network in ofed 1.3?
>>>
>>>
>>> In terms of SM failover, modulo bugs fixed relative to this feature since
>>> OFED 1.3 (there are a couple of things here which may affect your
>>> environment if I recall correctly), you only need to run more than 1 SM for
>>> this (one will become master, the other standby).
>>>
>>> I'm aware that when master manager dies standby one comes in and manages
>>>> the network, but that does not necessary means that lids are preserved,
>>>> especially for nodes joining in. I used to run sldd.sh for distributing lids
>>>> list on ofed 1.2.5, but while this script seems to be in place noone
>>>> mentions necessity for it.
>>>
>>>
>>> So subnet manager failover is provided by running standby opensm.
>>>
>>>
>>> And how LID preservation is provided?
>>>
>>>
>>> If you want LIDs to be preserved, the guid2lid file needs to be sync'd
>>> (copied from the master SM once it's fully assembled to the node which is
>>> running the standby SM). That's what the sldd.sh script does.
>>>
>>> -- Hal
>>>
>>> Regards,
>>>>
>>>> Zdenek Kovlensky
>>>>
>>>> ----------------------------------------------------------------------
>>>> Kup wlasne mieszkanie za 33 tys. zl!
>>>> Sprawdz >>> http://link.interia.pl/f22f2
>>>>
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>>>
>>>
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>>
>>
>>
>> --
>> Best Regards,
>> PN Lai
>> HPC Specialist
>> Galactic Computng Corp.
>> Tel: 86-755-26733939 ext 826
>> Mobile: 86-13823161729
>> Fax: 86-755-26733780
>> URL: http://www.galactic.com.hk
>>
>
>


-- 
Best Regards,
PN Lai
HPC Specialist
Galactic Computng Corp.
Tel: 86-755-26733939 ext 826
Mobile: 86-13823161729
Fax: 86-755-26733780
URL: http://www.galactic.com.hk
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