Re: Drive tester

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cc'ing: linux-ide@xxxxxxxxxxxxxxx

maybe they can help

On Thu, Jul 23, 2009 at 6:12 PM, Bill Weiler<weilerb@xxxxxxxxxxx> wrote:
>
>
> ________________________________________
> From: Greg Freemyer [greg.freemyer@xxxxxxxxx]
> Sent: Thursday, July 23, 2009 2:31 PM
> To: Bill Weiler
> Cc: Kernelnewbies
> Subject: Re: Drive tester
>
> On Wed, Jul 22, 2009 at 7:55 PM, Bill Weiler<weilerb@xxxxxxxxxxx> wrote:
>> I wanted to make an Application that could send scripted SCSI and SATA
>> commands to my drives. I have found my Fedora Linux to be too complex to
>> control the drives in this way. I have looked at minimal Linux but I think
>> this would have the same problem. Is there an easier Open Source OS, or an
>> embedded PC Linux that would be easier to modify?
>
> Bill,
>
> For sata drives, have you looked at the SG_IO interface?
>
> That is how hdparm interfaces with the kernel.  I know it sends a lot
> of low level ATA commands to the drive from user space.  I think most
> use the SG_IO interface.  How much simpler can it get?
>
> strace hdparm may give you an education as to how simple it is.
>
> fyi: I believe the kernel looks for dangerous ata commands and blocks
> them.  But I think those are the types of commands that cause data
> loss.  Not sure what the criteria is.
>
> I have studied hdparm and the SG_IO interface and delved into the scsi drivers and ata drivers.
>
> For example, I wanted to script a single NCQ and a single NCQ write. A normal read(fd,buf,4096) does 1 NCQ read but a write(fd,buf,4096) does dozens of NCQ reads before doing the 1 NCQ write. How do I get rid of these reads?
>
> Also, I need to do soft and hard resets and these are not exposed.
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