[CentOS] AIC7901 RAID320 with CENTOS4 not recognized

Rodrigo Barbosa rodrigob at suespammers.org
Sun Oct 30 15:50:02 UTC 2005

Hash: SHA1

On Sat, Oct 29, 2005 at 06:07:35PM -0500, Erick Perez wrote:
> But having a "fake" bios doing raid1 isnt' more stable/better than to
> emulate raid1 in software?

Actually, no.
First, it is not really an emulation, but a full directly implementation.
The second reason is that the raid implemented by the controler is also
software based, and Linux raid1 implementation is supperior.

> 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).

Again, no.
It is not that Linux is not complatible with HostRAID. It is most of
a fact that HostRAID does not exist by itself.

Think of it this way. When you implement Raid1 using Linux on those
drives, and then boot the same machine on Windows, Windows won't
recognize the md device either. It is exactly the same thing.
HostRAID is as much of a software raid as Linux softraid.

Of course this is a simplification, but it is what HostRAID really
boils down to in the end.


- -- 
Rodrigo Barbosa <rodrigob at suespammers.org>
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

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