linux-kernel - Re: port multiplier problem

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Date:	Tue, 02 Feb 2010 09:17:01 -0500
From:	Chandra Shekhar Sah <edu4madh@...il.com>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: port multiplier problem

Hi Tejun,

Thanks a lot for reply.

The disk array was connected to suse 10.3 before accident and was 
working fine. After accident, I saw problems, so I switched to Fedora 12 
because it has up-to-date sil24 driver for sata host controller sil3124.

Now, I am using Fedora 12 (kernel 2.6.31.12). The backplane card 
(NORCO-LIB1220) on the disk array has 12 sata conectors, 5-5-1-1. i.e. 
there are two port multiplier (sil3726, 5 sata ports in each PMP) and 
two are without port multiplier, I mentioned it as "direct sata" (may be 
not appropriate word).

I thought PMP is damaged so I purchased a new NORCO-LIB1220 backplane 
card but same problem. The disks connected to PMP are not being 
recognized. However, disk connected to "direct sata" (no disks on PMP) 
is fine.

I greatly appreciate your help.
CN



On 2/1/10 10:40 PM, Tejun Heo wrote:
> Hello,
>
> On 01/22/2010 01:51 AM, Chandra Nepali wrote:
>    
>> I have a disk array of 12 disks. The interface card has two sil3726 port
>> multiplier for 10 disks (5 disks in each port multiplier) and 2 direct
>> sata connectors. The host controller is sil3124. It was connected to
>> suse 10.4 and working fine.
>>      
> Wasn't 10.3 the last of 10 series?  After that it was 11.0.  What's
> the version of the kernel?
>
>    
>> There was a high voltage accident (high voltage to disk array only, not
>> computer) and because of that we replaced the power supply of this disk
>> array. Now, we are getting some problem, disks are not being
>> recognized,.
>>      
> Ouch...
>
>    
>> So, I connected it to Fedora 12 (To correct if it is
>> because of some bugs) with driver sil24. Here are few things that I have
>> tested.
>>
>> 1) If I connect only one disk to direct sata connector, it works fine.
>> 2) If I connect two disks to both direct sata connectors, it won't work.
>> 3) If I connect  one disk to one direct sata and one disk directly to
>> host controller, it works.
>>      
> What do you mean by 'direct sata'?  How is it different from 'directly
> to host controller'?
>
>    
>> 3) If I connect one or more disk to PM, it won't work.
>> 4) If I connect one disk to direct sata and one to PM, it won't work.
>>      
> Maybe the PMP is fried?
>
> Thanks.
>
>    

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