Re: Adaptec AIC-79xx HostRaid

[Jeff Garzik <jgarzik@pobox.com>]

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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