Paul Smith wrote:
On 8/28/06, Brian Chadwick <brianchad@xxxxxxxxxxxxxx> wrote:
> Is there some way to make permanent/default the change operated by
> '/sbin/hdparm -d1 /dev/dvd', i.e., choosing dma on as default?
>
the best setting is very often selected automatically ... what version
of fedora are u using?
do hdparm -i /dev/hdx ... and have a look at the dma modes ... the
current mode is indicated by a *
u only need to use hdparm if that highest dma mode is not the current
setting
Thanks, Brian. I am using FC5. And
# /sbin/hdparm -i /dev/dvd
/dev/dvd:
Model=_NEC DVD_RW ND-3520A, FwRev=1.04, SerialNo=
Config={ Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=yes, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2
AdvancedPM=no
* signifies the current active mode
#
And now?
Paul
hmmm......i have never seen hdparm not return a current mode ... intriguing.
anyway ... the permanent way to save the changes is to put a command in
your /etc/rc.d/rc.local file
edit that file and at the end of the file put in "/sbin/hdparm /dev/hdx
-your-parameters"
from the output of hdparm i would try "/sbin/hdparm /dev/hdx -d1 -m32 -X
udma2" where hdx is like hdc or hdd .. whichever device /dev/dvd is
linked to. i suppose using a symbolic link (dvd) to the real drive is ok
... but i like to directly address the device
that is the highest performance the drive will support ... what it means
is ... use dma, and use 32 bit access, and use udma2 dma mode. If the
drive does not perform properly with that setting, progressivley try
less aggressive settings....eg. -X udma1, -X udma0, -X mdma2, ... etc
you are using a recent motherboard chipset, so i doubt you will need to
reduce the settings from what i have suggested .. though i must say i am
perplexed that hdparm has not indicated a current mode ...
let me know how you go ... cheers
