[CentOS] AIC7901 RAID320 with CENTOS4 not recognized

Erick Perez eaperezh at gmail.com
Sat Oct 29 23:07:35 UTC 2005

But having a "fake" bios doing raid1 isnt' more stable/better than to
emulate raid1 in software?

however, thinking of benchmarks, the machine in question is a dual
xeon with 512mb ram doing web,smtp,pop3 and a small mysql for 50
users. I think raid 1 with the linux driver will be more than

However the main question remains, Why the adaptec 79xx driver does
not "see" that I created a raid1 in the bios? why keeps showing me two
"drives" instead of one?

Cause that will mean that the linux 79xx is not "fully" compatible
(ok, it is 99.999999% compatible) with the  AIC-7901 Adaptec 320 with
HostRAID (fake BIOS or not).

Comments welcomed,

On 10/29/05, Aleksandar Milivojevic <alex at milivojevic.org> wrote:
> Erick Perez wrote:
> > An INTEL Server motherboard model SE7501BR2 with an onboard Adaptec
> > AIC7901 controller (with HostRAID) is not being recognized by CENTOS
> > 4.
> > The AIC79xx driver loads correctly, however it does not "see" the fact
> > that I used the HostRAID onboard software to create a RAID 1 set.
> >
> > I went to the INTEL site and only found a driver for RHEL 3.0 and I
> > was unable to find a driver on the adaptec site.
> >
> > The CENTOS4 installer gives me the option to create partitions, raids, etc.
> > This is not what we want since creating a RAID by software it's
> > supposed to be more slow that doing it hardware based right?
> >
> > Does the CENTOS4 support the AIC7901 with HostRAID or not?
> In Adaptec speak HostRAID is software RAID.  What you have is not
> hardware RAID controller.  The card is really just a standard SCSI
> controller with fake RAID BIOS.  Create software RAID devices under
> CentOS (and you'll get exactly the same thing as if configuring them in
> BIOS and using Adaptec device driver).
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Erick Perez
Linux User 376588
http://counter.li.org/  (Get counted!!!)
Panama, Republic of Panama

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