[CentOS] centos 5.5 install + intel raid

[Gene Brandt]

Great information to know.  That sounds like a very nasty situation.
--
Thanks,

Gene Brandt SCSA 
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On Thu, 2011-01-06 at 12:40 -0800, John R Pierce wrote:

> On 01/06/11 11:11 AM, Gene Brandt wrote:
> > Thanks for that bit of advice. I've never been able to recover from 
> > hardware raid on any Intel system. The software raid is simple to 
> > configure and it works!
> 
> its not actually hardware raid.
> 
> when you set the 'raid mode' in the BIOS, at power up it sets a bit in 
> the ICH chip which changes its PCI DeviceID from 'regular SATA 
> controller' to 'Intel Matrix FakeRaid'.    thats *ALL* it does, change 
> the device ID. no other hardware changes.    the controller is still a 
> plain old multiport SATA controller.
> 
> the device ID is used to pick which driver by the OS plug-n-play 
> stuff.   the regular setting choses the regular SATA driver while the 
> 'fakeraid' setting loads the fakeraid driver (dmraid in Linux).    the 
> fakeraid driver implements all the raid in the device driver.    This is 
> only really useful for MS Windows non-Server distributions which don't 
> support native mirroring or whatever in the OS.
> 
> 
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