[CentOS] Re: Raid5 issues

Ruslan Sivak rsivak at istandfor.com
Mon May 7 16:49:03 UTC 2007


Scott Silva wrote:
> Ruslan Sivak spake the following on 5/5/2007 9:16 AM:
>   
>> William Warren wrote:
>>     
>>> rus,
>>>
>>> This is critical
>>>
>>> turn off the raid functions of your bios.  You must do this or the
>>> fakeraid of the bios WILL interfere with md's ability to perform. 
>>> Then try building the md raid.
>>>
>>>
>>>       
>> William,
>>
>> This might be a bit of a problem.  The computer is quite old, and I had
>> to get a raid card just to be able to connect sata drives to it.  The
>> bios boot order only lists the cdrom (I can't even get it to boot from
>> floppy).  The only way I can get it to boot off these hard drives is if
>> I have them in some sort of raid set up through the card's bios (even
>> concatenation works).  Unfortunatelly, with concatenation, if 1 drive
>> dies, I am forced to recreate the array, which kills things.
>> I think I need to use the fakeraid driver.  It keeps popping up anyway
>> with weird error messages.  For example, when there is no raid set up, I
>> keep getting something like this:
>>
>> Error adding sda to set silxxxxxxx: Raid type 234 is not supported. 
>> (This is from memory, so probably not exactly correct).
>> I tried updating the bios, but I can't even seem to do that.  It won't
>> boot off the floppy, and when I boot of any dos based cdrom, I can't see
>> the floppy.  (I have external usb floppy.  The internal one doesn't seem
>> to work).
>> Russ
>>     
> Can you add each drive as a separate stripe?
> IE.. 4 drives, 4 arrays, 1 drive per array. I had to do that with an old
> promise card I used as a controller.
>
>   
William,

Thanks for the suggestion.  I actually though of the same thing this 
morning, and added the first drive to it's own (concatenated) array.  
That seemed to work and allow it to boot. I still can't get raid10 to 
work, but I'll start a new thread on that.

Russ



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