***SPAM*** Re: [ofa-general] link width problem of Qlogic 9024 unmanaged switch

[Ira Weiny]

On Fri, 17 Apr 2009 12:06:43 -0500
Yicheng Jia <YJia at tmriusa.com> wrote:

> Hi Ira,
> 
> Here is the output of "iblinkinfo.pl -R":
> 
> ++++++++++++++++++++++++++++++++++++++++++++++++
> [root at ib_manager ~]# iblinkinfo.pl -R
> Switch 0x00066a00d90009c1 InfiniCon System InfinIO 9024 Lite:
>       7    1[  ]  ==( 4X 2.5 Gbps Active /   LinkUp)==>       6    1[  ] "MT2520 4 InfiniHostLx Mellanox Technologies" (  )
>            2[  ]  ==( 4X 2.5 Gbps   Down /  Polling)==>             [  ] "" (  )
>            3[  ]  ==( 4X 2.5 Gbps   Down /  Polling)==>             [  ] "" (  )
>            4[  ]  ==( 4X 2.5 Gbps   Down /  Polling)==>             [  ] "" (  )

[snip]

> 
> And the "ibstat" output:
> +++++++++++++++++++++++++++++++++++
> [root at ib_manager ~]# ibstat
> CA 'mthca0'
>         CA type: MT25204
>         Number of ports: 1
>         Firmware version: 1.2.0
>         Hardware version: a0
>         Node GUID: 0x0002c90200230784
>         System image GUID: 0x0002c90200230787
>         Port 1:
>                 State: Active
>                 Physical state: LinkUp
>                 Rate: 10
>                 Base lid: 6
>                 LMC: 0
>                 SM lid: 6
>                 Capability mask: 0x02500a6a
>                 Port GUID: 0x0002c90200230785
> ++++++++++++++++++++++++++++++++++++++++++++++
> 
> The reset command I am using is "ibportstate 7 1 reset", I also tried 
> "ibportstate -D 0,1 1 reset", and it fails with the same result.
>

Yea that is going to be a problem.  The problem is that effectively you just
disabled the connection to the switch.  A reset disables then enables the
port.  Once the port is disabled the command can't talk to the switch any
longer.  You will have to either reset the switch (power cycle) or go to
another node and enable the port.  From the output you sent me it looks like
you don't have any other nodes on the switch, so I take it you are resetting
the switch to get the link to come back?

I thought there was a warning in the man page or in the help regarding this
situation but I don't see it now.

Also, this becomes worse if you disable the port the SM is on.  (Which I see
you are doing.)  So you will have a noticeable delay while the SM rescans the
network which it is now seeing "again" for the first time.

BTW, What are you trying to achieve with this command?

Hope this helps,
Ira