How to set hdparms for ide-scsi devices on devfs?

How to set hdparms for ide-scsi devices on devfs?

[Eduard Hasenleithner]

Sorry, if this issue was already discussed in lkml. I didn't find
a reference to this at www.geocrawler.com

My Problem:
I want to set the unmaskirq and dma -flag for my ide cd-recorder.
The Problem is, that devfs creates no ide device, but only
the /dev/scsi/../{cd,general} devices are created. And hdparm
don't accepts this devices for setting the ide-parameters.

My current workaround is to create a /dev/hd? device "by hand"
at system startup. This is not very beautiful. Furthermore, if
the device numbers in devfs are deactivated, this won't work
anymore.

I can live with my current solution. But i would be very happy
if someone can present a clean solution.

I posted this message intentionally not on the devfs mailing list
as i think this problem is related to accessing the same device
through different /dev entries. Under devfs, the /dev/ide/...
device node gets allocated after the corresponding ide-xx.o has
been loaded. But this is not possible with ide-scsi claiming
the device :(

Thanks in advance

-- 
Eduard Hasenleithner
student of
Salzburg University of Applied Sciences and Technologies

Re: How to set hdparms for ide-scsi devices on devfs?

[Jeremy Jackson]

Eduard Hasenleithner wrote:

> Sorry, if this issue was already discussed in lkml. I didn't find
> a reference to this at www.geocrawler.com
>
> My Problem:
> I want to set the unmaskirq and dma -flag for my ide cd-recorder.
> The Problem is, that devfs creates no ide device, but only
> the /dev/scsi/../{cd,general} devices are created. And hdparm
> don't accepts this devices for setting the ide-parameters.
>
> My current workaround is to create a /dev/hd? device "by hand"
> at system startup. This is not very beautiful. Furthermore, if
> the device numbers in devfs are deactivated, this won't work
> anymore.
>
> I can live with my current solution. But i would be very happy
> if someone can present a clean solution.
>
> I posted this message intentionally not on the devfs mailing list
> as i think this problem is related to accessing the same device
> through different /dev entries. Under devfs, the /dev/ide/...
> device node gets allocated after the corresponding ide-xx.o has
> been loaded. But this is not possible with ide-scsi claiming
> the device :(
>
> Thanks in advance

workaround - before ide-scsi is loaded in boot sequence
(finding is left as an exercise to the reader :) do:

modprobe ide-cd
hdparm -u 1 -d 1 /dev/xxx
rmmod ide-cd

might have to do near top of /etc/rc.d/rc.sysinit under redhat,
but this is good since problems will happen before root filesystem
is remounted read-write, so any problems with hdparm settings
won't mess up disk.

Re: How to set hdparms for ide-scsi devices on devfs?

[Andre Hedrick]

procfs

echo unmaskirq:1 /proc/ide/hdx/settings

Andre Hedrick
Linux ATA Development
ASL Kernel Development
-----------------------------------------------------------------------------
ASL, Inc.                                     Toll free: 1-877-ASL-3535
1757 Houret Court                             Fax: 1-408-941-2071
Milpitas, CA 95035                            Web: www.aslab.com

Re: How to set hdparms for ide-scsi devices on devfs?

[Eduard Hasenleithner]

On Thu, Mar 01, 2001 at 03:10:53AM -0800, Andre Hedrick wrote:
> 
> procfs
> 
> echo unmaskirq:1 /proc/ide/hdx/settings
> 

Thank you, thats perfect. Is setting the parameters a relatively
new feature? I searched for a possibiliy like this and found no
references.

PS: Is there still a possibility for setting the IDE-sleep timeout
	for a ide-scsi harddisk?  (I know, this doesnt make sense)
-- 
Eduard Hasenleithner
student of
Salzburg University of Applied Sciences and Technologies

Re: How to set hdparms for ide-scsi devices on devfs?

[Wakko Warner]

> PS: Is there still a possibility for setting the IDE-sleep timeout
> 	for a ide-scsi harddisk?  (I know, this doesnt make sense)

I didn't know you could use ide-scsi emulation for hard drives.

-- 
 Lab tests show that use of micro$oft causes cancer in lab animals

Re: How to set hdparms for ide-scsi devices on devfs?

[Jeremy Jackson]

Wakko Warner wrote:

> > PS: Is there still a possibility for setting the IDE-sleep timeout
> >       for a ide-scsi harddisk?  (I know, this doesnt make sense)

Yeah, why would you ?   ide-scsi is mainly to support cd-rw
drives, AFAIK

>
>
> I didn't know you could use ide-scsi emulation for hard drives.
>
> --
>  Lab tests show that use of micro$oft causes cancer in lab animals
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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Re: How to set hdparms for ide-scsi devices on devfs?

[Jens Axboe]

On Fri, Mar 02 2001, Jeremy Jackson wrote:
> Wakko Warner wrote:
> 
> > > PS: Is there still a possibility for setting the IDE-sleep timeout
> > >       for a ide-scsi harddisk?  (I know, this doesnt make sense)
> 
> Yeah, why would you ?   ide-scsi is mainly to support cd-rw
> drives, AFAIK

It's a general SCSI-over-ATAPI interface, and as such regular ATA
hard drives cannot be run with ide-scsi.

-- 
Jens Axboe

Re: How to set hdparms for ide-scsi devices on devfs?

[Andre Hedrick]

There are mystert ATAPI harddrives in the world!

On Fri, 2 Mar 2001, Wakko Warner wrote:

> > PS: Is there still a possibility for setting the IDE-sleep timeout
> > 	for a ide-scsi harddisk?  (I know, this doesnt make sense)
> 
> I didn't know you could use ide-scsi emulation for hard drives.
> 
> -- 
>  Lab tests show that use of micro$oft causes cancer in lab animals
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

Andre Hedrick
Linux ATA Development
ASL Kernel Development
-----------------------------------------------------------------------------
ASL, Inc.                                     Toll free: 1-877-ASL-3535
1757 Houret Court                             Fax: 1-408-941-2071
Milpitas, CA 95035                            Web: www.aslab.com