Re: iostats broken for devices with major number > DK_MAX_DISK (16)

Cliff White (cliffw@osdl.org)
Tue, 12 Nov 2002 15:25:43 -0800


> On Tue, 2002-11-12 at 20:35, Per Andreas Buer wrote:
> > Hi,
> >
> > sorry for the intrusion. I noticed iostats didn't display statistics for
> > devices on Mylex RAID constrollers. Det statistics are completely
> > missing in /proc/stat. The reason seems to be an assumption that disks
> > have major numbers which are below 16
> > (http://lxr.linux.no/source/include/linux/kernel_stat.h#L15) which is
> > used by http://lxr.linux.no/source/fs/proc/proc_misc.c#L344.
> >
> > Devices on Mylex-controllers have major number 48. Would it break
> > anything if DK_MAX_MAJOR if set higher (e.g. 64)?
> >
> > AFAIK this goes for both 2.4 and the 2.5 series.
>
> i have been runing with 2.4.x kernel with this number
> set higher i have still yet to see any problem with it
> other than using more memory.
>
We've had the same problem, and we've been running with DK_MAX_MAJOR == 64,
using megaraid and acceleraid 2000 controllers.
Haven't seen any problems
cliffw
OSDL
>
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