[CentOS] CentOS 5.1 on intel DQ35JO , Q35 chipsed based board

[John R Pierce]

David Hláčik wrote:
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>     turn that fake raid crap off, and use linux software raid instead.
>     Anaconda makes combining linux raid mirroring and LVM a bit tricky at
>     setup time, but it -can- be done. custom disk partitioning, delete all
>     partitions, create a 120MB /boot on both drives, create a raid1 mirror
>     on the rest of the two drives, then create LVM partition(s) as / (and
>     /var,/home, whatever if you want several seperate file systems, your
>     choice) in that raid metadisk, and install to that.
>
> Hi John, thank you very much for information. Alltought i am not aware 
> why is better use software raid than raid solution provided by that 
> board. Or it is so that its also software raid imitation that uses own 
> software (somewhere in raid bios) to do the same as linux software 
> raid can provide? What about the speed , does it affects somehow?


the onboard 'raid' is fake raid, implemented in the BIOS and Windows 
device drivers. horrid nasty stuff. the actual hardware is simply SATA 
channels. Linux's own raid is MUCH smarter about things and more 
predictable, also higher performance as it has a much better idea of 
whats going on than the device driver layer could.

see 
http://thebs413.blogspot.com/2005/09/fake-raid-fraid-sucks-even-more-at.html 
for a discussion of this.