[NTLUG:Discuss] Software RAID woes

[Chris Cox]

I could be wrong....but I'd say the shared irq is the problem.  You'll need
to determine the irq's for the two controllers and then you may have
to force the settings with boot parameters or something like that.

It may not solve all of the problems....but I think it's a start.

(I'm afraid much of the detail of how exactly to determine the irq's is
left up to the reader....haven't tried it in other words)

Chris

Scott Ripley wrote:
> 
...snip
> 
> The only thing I noticed out of the ordinary on the system is that the
> ide2 and ide3 controllers are using the same "IRQ?". I'm not sure if
> that is the right term, as it is set to 18.
> 
> twin:~$ cat /proc/interrupts
>            CPU0       CPU1
>   0:      40712      26622    IO-APIC-edge  timer
>   1:          2          1    IO-APIC-edge  keyboard
>   2:          0          0          XT-PIC  cascade
>   9:          0          0    IO-APIC-edge  acpi
>  12:          8          4    IO-APIC-edge  PS/2 Mouse
>  13:          1          0          XT-PIC  fpu
>  14:       3750       1987    IO-APIC-edge  ide0
>  15:         16          1    IO-APIC-edge  ide1
>  16:         68         59   IO-APIC-level  eth0
>  18:          7          7   IO-APIC-level  ide2, ide3
> NMI:      67245      67245
> LOC:      67254      67252
> ERR:          0
> twin:~$
> 
> If someone could enlighten me to the ways of SMP IO-APICs (and all the
> xtra IRQs) that would be great too. I'm an old school XT/AT guy, and
> anything above 15 doesn't quite make sense to me. :) I'm sure they could
> share the interrupt under normal circumstances, but would "simultanious"
> access be a problem?
> 
> Also, the software package I am using is mdtools V0.41. I have seen
> mention of a renamed raidtools V0.90, but I have had no luck in finding
> it. This too could be a problem.
> 
> I have been looking at this all night. So, if any of this doesn't make
> any sense I could just be tired.
> 
> TIA,
> 
> Scott
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