From: Samuel Flory <sflory@rackable.com>
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Chad Kitching <CKitching@powerlandcomputers.com>,
Steven Dake <sdake@mvista.com>,
linux-kernel@vger.kernel.org, andre@linux-ide.org
Subject: Re: IDE/Promise 20276 FastTrack RAID Doesn't work in 2.4.21, patchattached to fix
Date: Thu, 10 Jul 2003 16:04:56 -0700 [thread overview]
Message-ID: <3F0DF118.3080806@rackable.com> (raw)
In-Reply-To: <Pine.SOL.4.30.0307110011320.6781-100000@mion.elka.pw.edu.pl>
Bartlomiej Zolnierkiewicz wrote:
>On Thu, 10 Jul 2003, Chad Kitching wrote:
>
>
>
>>I don't know. That seemed to have changed the option from merely
>>mystifying to down right confusing. By that wording, does that feature
>>override it into being a plain IDE controller, or an IDE RAID controller?
>>The new name seems to imply the former, while the mentions
>>of ataraid suggest the latter.
>>
>>
>
>Hmmm... you are right. Comment is still misleading in respect to RAID.
>
>ataraid driver is a _software_ RAID, just like Promise's binary driver.
>
>FastTracks have software RAID. There are few true hardware FastTrak
>RAID controllers with I2O interface but we probe for them properly in
>pdc202xx_new.c driver and don't use IDE driver for them.
>
>
>
>>Despite the grammatical errors, pdc202xx.c's comments perhaps describe it
>>better.
>>* Linux kernel will misunderstand FastTrak ATA-RAID series as Ultra
>>* IDE Controller, UNLESS you enable "CONFIG_PDC202XX_FORCE"
>>* That's you can use FastTrak ATA-RAID controllers as IDE controllers.
>>
>>
>
>It is quite opposite.
>
>
>
>>If this is true, may I suggest something more along the lines of:
>>
>>Ignore FastTrak BIOS and configure controller for RAID
>>CONFIG_PDC202XX_FORCE
>> Forces the driver to use the ATA-RAID capabilities, overriding the
>> BIOS configuration of the controller. Do not enable if you are
>> using Promise's binary module. This option is compatible with the
>> ataraid driver.
>>
>>
>
>What about this:
>
Much better, but
>
>Ignore FastTrak BIOS
>CONFIG_PDC202XX_FORCE
> Forces the driver to use FastTrak controller even if it was disabled
> by BIOS for Promise software RAID driver.
>
This one might confuse people thinking we mean the ataraid driver, and
not the binary only driver.
Maybe:
Forces the driver to use FastTrak controller even if it was disabled
by BIOS for Promise's binary only software RAID driver.
>
> Say Y if you do not use Promise's software RAID or
> if you want to use ataraid driver.
>
>
> Say N if you want to use Promise's binary module.
>
>
>
>>If the Linux driver has the same limitation in regards to using CD-ROM
>>drives on the controller while it's in RAID mode as the Windows drivers
>>do, it may be useful to mention the fact that the option is incompatible
>>with CD-ROM drives attached to the controller.
>>
>>
>
>It has. According to Andre it is doable but big pain,
>also Promise gives docs under NDA which makes it even harder.
>
>Please search lkml archive if you want know technical details.
>
>
>
>>Of course, maybe it means the complete opposite, and I'm reading everything
>>wrong, in which case, there are some comments you may want to fix, too.
>>
>>
>
>Comments in Promise driver need fixing.
>
>
>
--
Once you have their hardware. Never give it back.
(The First Rule of Hardware Acquisition)
Sam Flory <sflory@rackable.com>
next prev parent reply other threads:[~2003-07-10 22:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-10 22:05 IDE/Promise 20276 FastTrack RAID Doesn't work in 2.4.21, patchattached to fix Chad Kitching
2003-07-10 22:18 ` Samuel Flory
2003-07-10 22:29 ` Steven Dake
2003-07-10 22:51 ` Samuel Flory
2003-07-10 23:13 ` Bartlomiej Zolnierkiewicz
2003-07-10 23:57 ` Steven Dake
2003-07-10 23:24 ` Steven Dake
2003-07-10 23:43 ` Bartlomiej Zolnierkiewicz
2003-07-10 23:54 ` Samuel Flory
2003-07-11 0:18 ` Bartlomiej Zolnierkiewicz
2003-07-10 22:55 ` Bartlomiej Zolnierkiewicz
2003-07-10 23:04 ` Samuel Flory [this message]
2003-07-12 15:11 ` Ruth Ivimey-Cook
2003-07-12 16:14 ` Bartlomiej Zolnierkiewicz
2003-07-12 17:01 ` Ruth Ivimey-Cook
2003-07-14 17:31 ` Samuel Flory
2003-07-14 18:49 ` Alan Cox
2003-07-12 18:36 Bartlomiej Zolnierkiewicz
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