From: Mark Lord <lkml@rtr.ca>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@osdl.org>,
Jeff Garzik <jgarzik@pobox.com>, Conke Hu <conke.hu@amd.com>,
linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
Andrew Morton <akpm@osdl.org>
Subject: Re: AHCI should try to claim all AHCI controllers
Date: Wed, 01 Nov 2006 09:37:49 -0500 [thread overview]
Message-ID: <4548B13D.6070501@rtr.ca> (raw)
In-Reply-To: <1162383783.11965.116.camel@localhost.localdomain>
Alan Cox wrote:
> Ar Maw, 2006-10-31 am 21:22 -0800, ysgrifennodd Linus Torvalds:
>> (We had the same issue with "PCI IDE controller". Some PCI IDE controllers
>> are clearly exactly that from a programming interface standpoint, but
>> because they support RAID in hardware, they claim to be RAID controllers,
>> since that is more "glamorous". Gaah ;^).
>
> Actually its far uglier than that. With one exception they don't support
> hardware raid mode, they use the RAID class tag to stop other OS drivers
> grabbing the interface or seeing it directly as un-raided software raid.
Note that a lot of the software raid controllers actually have full
hardware RAID acceleration in the chipset (single block command is automatically
remapped across several drives of a RAID 0/1/10 configuration, reducing bus
transactions and bandwidth requirements.
But they still require a driver do perform the RAID management,
and are thus not true "hardware" RAID. But they are higher on the
food chain than total "pretend" RAID devices.
Cheers
next prev parent reply other threads:[~2006-11-01 14:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-31 15:06 AHCI should try to claim all AHCI controllers Conke Hu
2006-10-31 15:06 ` Conke Hu
2006-11-01 5:07 ` Jeff Garzik
2006-11-01 5:22 ` Linus Torvalds
2006-11-01 5:35 ` Jeff Garzik
2006-11-01 12:23 ` Alan Cox
2006-11-01 14:37 ` Mark Lord [this message]
2006-11-01 5:11 ` Jeff Garzik
-- strict thread matches above, loose matches on Subject: below --
2006-11-01 13:39 Conke Hu
2006-11-01 13:39 ` Conke Hu
2006-11-02 13:15 ` Martin Waitz
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