[ofa-general] questions about opensm and unmanaged switch

[Yicheng Jia]

Hi Sasha,

The error I got are "osm_db_store: ERR 6109: Failed to remove 
file:/tmp//guid2lid" and "osm_db_store: ERR 6108: Failed to rename the db 
file to:/tmp//guid2lid". I set "OSM_DEFAULT_CACHE_DIR" to "/tmp/". Could 
it be the reason of slow?

Thanks!
Yicheng




Sasha Khapyorsky <sashak at voltaire.com> 
10/01/2008 08:05 PM

To
Yicheng Jia <YJia at tmriusa.com>
cc
general at lists.openfabrics.org
Subject
Re: [ofa-general] questions about opensm and unmanaged switch






Hi Yicheng,

On 12:35 Wed 01 Oct     , Yicheng Jia wrote:
> 
> I use opensm with a single unmanaged switch to connect several HCAs. I 
> found that HCAs take much longer time to get LID after opensm restart 
> without power cycle the switch. If the switch is power off/on before 
> opensm restart, then HCAs get their LIDs sooner. I'm wondering if 
there's 
> minhop table pre-existing in the switch which will prevent HCAs from 
> regain their LIDs soon. Is there any way to clean up the switch's hop 
> table during opensm start?

In first run OpenSM will not fetch existing LFTs from the switch and
will setup this from "scratch". I think that the reason for delay should
be different. Also it is single-switch subnet, its setup should be
reasonably fast in both cases. Do you see any errors in OpenSM log file?

> my another question, should the HCA that opensm resides on be physically 

> connected to switch port 0?

No. Port 0 is switch's management port and normally it doesn't have
physical connection.

Sasha

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