Message-ID: <429B5586.8040004@pobox.com>
Date: Mon, 30 May 2005 14:03:50 -0400
From: Jeff Garzik <jgarzik@pobox.com>
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To: Clemente Aguiar <caguiar@madeiratecnopolo.pt>
CC: linux-kernel@vger.kernel.org
Subject: Re: Adaptec AIC-79xx HostRaid
References: <6A0C419392D7BA45BD141D0BA4F253C776F2@loureiro.madeiratecnopolo.pt>
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Clemente Aguiar wrote:
>>On Mon, May 30, 2005 at 06:13:03PM +0100, Clemente Aguiar wrote:
>>
>>>Hello,
>>>
>>>We have acquired some IBM xServers which have an integrated raid
> 
> controller
> 
>>>based on the Adaptec AIC-79xx U320 SCSI controller (called HostRaid).
>>>
>>>Is there already support for HostRaid? Are there drivers for it?
>>>>From which kernel version and where do I find it in the config?
>>
>>HostRaid is just software RAID; you can ignore it and let Linux use the
>>underlying SCSI devices via the standard aic79xx driver.
>>
>>	Jeff
> 
> 
> What do you mean it is just software RAID? Can you explain?
> On the servers there is a configuration option to enable HostRaid, and when
> I turn that option ON the mirroring between the two discs start and after a
> while they are mirrored.
> I think that in terms of performance it should be better to used the
> "on-board" HostRaid facility.
> Don't you think so?

HostRaid is not on-board.  It is provided by your system CPU, through 
the card's BIOS and the OS driver.

HostRaid is software RAID, just like Linux's md.

	Jeff


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