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Re: Re: DMA is turned off on my HDD



> Pavlos Parissis wrote:
> >> In the beginning of July I reinstall my Debian system (lenny). At once I
> >> discover that loading cache in Aptitude (ncurses-UI mode) is very slow
> >> and in general my system is very slow.
> >>
> >> In several days I discovered that DMA is turned off on my HDD (fsck
> >> sayed it while Debian booting). Please, help me turn on DMA mode.
> >>
> >>
> > [snip]
> >> I had scanned my hdd with native WD scanner and hadn't detected any
> >> error. Memory scan (memtest86+) also hadn't detected any error.
> >> Moreover, Windows XP on another partition of this hdd working normally
> >> and HDD Health program on it (for S.M.A.R.T viewing) don't predict
> >> T.E.C. in the near future. Also after previous installation of Debian
> >> lenny my hdd was working fast.
> >
> > Use hdparm command to see if the DMS is enabled, if not enable it with the -d flag. If that action makes your system "faster" configure /etc/hdparm.conf to
> > enable the DMA on boot.
> >
> > Hope it helps,
> > Pavlos
> >
> >
> >
> >
> 
> I have tried using "hdparm" (under root) command but it don't help.
> 
> command "hdparm -d /dev/hda" outputs:
> /dev/hda:
>   using_dma     =  0 (off)
> 
> command "hdparm -d 1 /dev/hda" outputs:
> /dev/hda:
>   setting using_dma to 1 (on)
>   HDIO_SET_DMA failed: Operation not permitted
>   using_dma     =  0 (off)
> 
> 

As Ron has written you may face a problem with the driver which is being used
by the kernel for managing this disk.
Try the following to see which driver is being used.

readlink /sys/block/hda/device/driver


Cheers,
Pavlos




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