[CentOS] Re: Raid5 issues

Mon May 7 17:24:28 UTC 2007
Ruslan Sivak <rsivak at istandfor.com>

Scott Silva wrote:
> Ruslan Sivak spake the following on 5/7/2007 9:49 AM:
>   
>> 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
>>     
> I don't think you will get raid 10 out of the anaconda installer. I don't
> think it is supported yet. So even if the raid 10 driver is in the installer's
> initrd, you probably will not get a raid 10 from anaconda.
>
>
>   
This is what I've found as well.  Would the solution be to make a raid5 
(or 6) partition for / about 10GB and then once booted, set up the 
raid10 partition manually? 

How would I go about auto mounting it as /data or something like that?

Russ