[openib-general] LID assignment policy of opensm

[Eitan Zahavi]

Hi Devesh

If a user writes the file such that it is legal (see below) OpenSM will use it.
When a STANDBY SM gets mastership it has two choices:
a. Use the LIDs from the fabric
b. Enforce the assignments provided by the guid2lid file
The option

Legal means:
1. there are no LID conflicts
2. lid range start is aligned with 2^(LMC)
NOTE that the end of the range can extend beyond start + 2^(LMC) - 1

/var/cache/osm/opensm.opts:
# If true honor the guid2lid file when coming out of standby
# state, if such file exists and is valid
honor_guid2lid_file FALSE

Eitan
Devesh Sharma wrote:
> On 28 Feb 2006 13:36:27 -0500, Hal Rosenstock <halr at voltaire.com> wrote:
> 
>>Hi Devesh,
>>
>>On Tue, 2006-02-28 at 11:12, Devesh Sharma wrote:
>>
>>>Hi Hal Thanks for replying.
>>>This setisfies my needs if user can define his own guid to lid
>>>mapping.
>>>whether in this file user can define his own guid to lid mapping?
>>
>>To my knowledge it's not used that way in general but that could work if
>>consistent with the OpenSM LID policy (e.g. LMC, etc.).
> 
> 
> 
> consistent with the OpenSM LID policy means what? Is it that, That each GUID
> sholud have unique LID range?
> 
> 
> The format of the file is as follows:
> 
>>0x0008f10403960985 0x0007 0x0007
>>
>>0x0008f10400410015 0x0003 0x0003
>>
>>(e.g GUID, min LID, max LID so the above is for LMC 0 which is the
>>default).
>>
>>-- Hal
>>
>>
>>>Devesh
>>>
>>>On 28 Feb 2006 07:19:35 -0500, Hal Rosenstock <halr at voltaire.com>
>>>wrote:
>>>        Hi Devesh,
>>>
>>>        On Tue, 2006-02-28 at 01:44, Devesh Sharma wrote:
>>>        > Hi list,
>>>        > Please anybody brife me about the LID assignment policy used
>>>        by opensm
>>>        > subnet manager. Can user specify fixed LID mappings using a
>>>        file?
>>>
>>>        There is a file it creates with these in it so they can be
>>>        reused
>>>        subsequently. It is /var/cache/osm/guid2lid.
>>>
>>>        opensm -h has the following option:
>>>        -c
>>>        --cache-options
>>>                  Cache the given command line options into the file
>>>                  /var/cache/osm/opensm.opts for use next invocation
>>>                  The cache directory can be changed by the
>>>        environment
>>>                  variable OSM_CACHE_DIR
>>>
>>>        Is that suitable for your needs ?
>>>
>>>        -- Hal
>>>        >
>>>        >
>>>
>>______________________________________________________________________
>>
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>>
>>
> 
> 
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