/proc/stat and disk_io

/proc/stat and disk_io

[James Stevenson]

Hi

from /proc/stat i get the following

disk_io: (3,0):(167751,94458,3917566,73293,2420568)
(3,1):(59314,45093,2747844,14221,114376)
(11,0):(9855,9855,1258392,0,0)

except the device 11,0 is a cd-reader
and there is a device 11,1 which has been used
is there any reson why the stats dont show up ?
after all it is another disk.

thanks
    James


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Re: /proc/stat and disk_io

[Rene Rebe]

On Sun, 9 Dec 2001 16:19:45 -0000
"James Stevenson" <mistral@stev.org> wrote:

> Hi
> 
> >from /proc/stat i get the following
> 
> disk_io: (3,0):(167751,94458,3917566,73293,2420568)
> (3,1):(59314,45093,2747844,14221,114376)
> (11,0):(9855,9855,1258392,0,0)
> 
> except the device 11,0 is a cd-reader
> and there is a device 11,1 which has been used
> is there any reson why the stats dont show up ?
> after all it is another disk.

Linux definetly broken in this area! Linux (2.4) does not report other
any devices over either major 16 or minor 16. e.g. no /dev/hdb or /dev/hdd.

For my 4 IDE disk (on two different controllers) I only get:

disk_io: (3,0):(355075,157636,1744492,197439,2633848)

...

I'm thinking about fixing this on my onw using this patch as base:

http://www.swanson.uklinux.net/patch-diskio-2.4.16-1

> thanks
>     James
> 
> 
> --------------------------
> Mobile: +44 07779080838
> http://www.stev.org
>   4:10pm  up 1 day, 17:44,  2 users,  load average: 0.08, 0.08, 0.02


k33p h4ck1n6
  René

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Re: /proc/stat and disk_io

[Daniel Kobras]

On Sun, Dec 09, 2001 at 04:19:45PM -0000, James Stevenson wrote:
> from /proc/stat i get the following
> 
> disk_io: (3,0):(167751,94458,3917566,73293,2420568)
> (3,1):(59314,45093,2747844,14221,114376)
> (11,0):(9855,9855,1258392,0,0)
> 
> except the device 11,0 is a cd-reader
> and there is a device 11,1 which has been used
> is there any reson why the stats dont show up ?
> after all it is another disk.

Both cdroms are accounted, but only into the same slot (11,0). In function
disk_index() at the end of include/linux/genhd.h, you can add a line
	case SCSI_CDROM_MAJOR:
above the line containing SCSI_DISK0_MAJOR, and things will work as expected.
Several more complete patches have been floating around for a while.

Regards,

Daniel.