2002-10-22 23:36:11

by Luigi Genoni

Subject: 2.5.44: /proc/stat not reporting all disks statistics

HI,

I was modifying xosview to support I/O statistics (one graph for each
disk?) with new
/proc/stat, but then I saw that on my IDE system this file
was not reporting statistics from all disks.

I have on this system two disks, primary master and secondary master,
hda and hdc.

In /proc/stat
i see just:

disk_io: (3,0):(24382,16849,158610,7533,382512)

so, I see 22,0 disk (hdc) is somehow missing.

If needed I can check on a scsi system with three disks.

bests

Luigi

2002-10-23 07:57:52

by Daniel Kobras

Subject: Re: 2.5.44: /proc/stat not reporting all disks statistics

On Wed, Oct 23, 2002 at 01:42:18AM +0200, [email protected] wrote:
> I have on this system two disks, primary master and secondary master,
> hda and hdc.
>
> In /proc/stat
> i see just:
>
> disk_io: (3,0):(24382,16849,158610,7533,382512)
>
> so, I see 22,0 disk (hdc) is somehow missing.

By default, the kernel only collects statistics on majors 1 to 16. If
you want the disks on your second IDE channel to show up, go to
include/linux/kernel_stat.h and raise the limit DK_MAX_MAJOR to 22 or
higher. (Assuming 2.5 stats still work the same as in 2.4, that is.)

Daniel.