Re: no dma on raid devices
2004. április 27. 21:25 dátummal ezt írta:
> hi ya leva
>
> On Tue, 27 Apr 2004, LeVA wrote:
>
> since i'm hungry right now ... ( for lunch ) ... thought i'd reply
>
> insufficient info .. but lets c
>
> > Is it normal, that I can not enable the dma mode on my cd devices
>
> some cd support dma .. others dont
If I attache the dvdrom to the standard ide cable (ie. not raid) I can
enable dma, so it supports it...
>
> > which
> > are connected to raid.
>
> if you have a cdrom on the same ide cable as your other disk
> used in a raid setup ...
> - you just found out the old rule ..
>
> =
> = do NOT mix ata-33 cdrom with ata-66/100/133 disks on the same
> = ide cable
> =
>
> > If I enable the dma on my dvd-rom, I can not
> > read from the discs,
>
> are you talking about dvd or cdrom ???
I don't think it matters...
>
> maybe your dvd-rom gets confused when told to do something it
> doesnt know what to do
>
> > but if I disable the dma, the reading is very
> > slow, and eats lot of cpu res.
>
> back to the bad idea of dvd on the same ide cable as hard disks ??
Why it is a bad idea? I can safely mix the dvdroms with hdds on the
standard ide cable, and on the raid cables either. My problem is only
when I'm running some device on the raid cable, I can not enable the
dma, although I could enable it, on the standrad ide cable.
>
> > I'm using 2.4.26 kernel, maybe I should
> > use 2.6, or this is a normal issue on a raid drive?
>
> no ... NOT normal ... and has nothing to to with the kernel
> wrt to 2.4 or 2.6 vs cd or dvd vs raid
>
> c ya
> alvin
--
LeVA
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