[CentOS] centos 5.5 install + intel raid
John R Pierce
pierce at hogranch.com
Thu Jan 6 20:40:54 UTC 2011
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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