Re: Promise raid controller writes to disk, anybody know where?

[Anders Widman <andewid@tnonline.net>]

> bscott@ntisys.com wrote:

>>On Wed, 16 Apr 2003, at 8:24pm, reiser@namesys.com wrote:
>>  
>>
>>>I just bought this motherboard with a promise raid controller builtin
>>>whose manual mentions that it writes information to disk (volume and
>>>config info I believe).
>>>    
>>>
>>
>>  Some RAID controllers write information to the disk, but never expose it
>>to the host OS.  For example, say the RAID controller writes information to
>>the last block in the disk.  The disk it then presents to the host OS will
>>be one block shorter.  I don't know if your Promise "RAID controller" is 
>>one of those.
>>
>>  I put "RAID controller" in quotes because most Promise "RAID controllers"  
>>are simply a more-or-less standard IDE interface, with RAID done in software
>>on the host (the software either comes from the BIOS, or the device driver).  
>>You're likely better off using your OS's native software RAID in that event.
>>
>>  Also, AFAIK, support for Promise RAID controllers under Linux (I assume
>>you're running Linux) is poor at best.  You way want to avoid using it at
>>all.
>>
>>  
>>
> Ok, I'll not use it then.  I was thinking of mirroring, but I was 
> assuming it was all done in hardware....

 You  can  still  use  the  controller,  but  I would do the mirroring
 natively in Linux than depend on the Promise BIOS to do it.

   



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