[CentOS] Intel ICH9R Raid5 Recovery

[Ruslan Sivak]

Mark Pryor wrote:
> --- Ruslan Sivak <russ at vshift.com> wrote:
>
>   
>> Sorry for posting this twice, didn't look like it
>> made it before...
>>
>> Russ
>>
>> Ruslan Sivak wrote:
>>     
>>> I had a raid5 on an onboard Intel ICH9R chip under
>>>       
>> windows.  Windows 
>>     
>>> crashed, as it often does, and the array became
>>>       
>> degraded.  At some 
>>     
>>> point during the rebuild, I was doing some
>>>       
>> hardware maintanence and 
>>     
>>> unplugged one of the drives, and forgot to plug it
>>>       
>> back in.
>>     
>>> When I booted up, the array came back as failed. 
>>>       
>> I turned off the PC, 
>>     
>>> plugged the drive back in and powered it back on,
>>>       
>> but the array stayed 
>>     
>>> as failed.
>>> Is there a way to recover the data?  I heard
>>>       
>> dmraid supports ich9r 
>>     
>>> raid volumes, but I keep getting an error saying
>>>       
>> unsupported map state 
>>     
>>> 2.  I found out that dmraid doesnt' support raid 5
>>>       
>> (at least not on a 
>>     
>>> ICH9R chip).  I heard about this patch: 
>>> http://people.redhat.com/heinzm/sw/dm/dm-raid45/,
>>>       
>> but I'm not sure how 
>>     
>>> to apply it to a linux live cd.  Does anyone have
>>>       
>> any idea?
>>     
>>> Is there maybe a way to reset the metadata to make
>>>       
>> the intel 
>>     
>>> controller boot the array anyway?
>>>       
>
> One of the best live Linux CD's out there is the FC8
> http://mirrors.kernel.org/fedora/releases/8/Live/
>
> uses the 2.6.23 kernel. Knoppix 5.1 is Jan07 and
> kernel 2.6.19
>
> BTW, I hear a lot of negative things about dmraid and
> fakeraid. I have an FC5 desktop box dual booting WinXP
> and FC5 on fakeraid/Raid0 thats been perfect for over
> 3 years. That includes a kernel upgrade in FC5, which
> required me to run mkinitrd (since it froze during
> boot) to get it working.
>
>   
Do you think that live cd will have raid5 support for dmraid, or will I 
have to use that patch?

Russ