Hi everybody, saludos:
I don't know how to do it, I would like to set permanently the udma
settings from booting (Red Hat Linux 9 -Shrike).
I have a Serial ATA hard disk (Seagate, onboard Silicon Image 3112
controller)as hde, 1 DVD player (hdb) and a CD-ROM burner(hda). I've
collected info from Google, and read "man hdparm". I've tried with lines like /sbin/hdparm /dev/hde -->to see the settings that are on; by default,
almost everything is "off".
/sbin/hdparm -Tt /dev/hde ---> to see timing reads;
/sbin/hdparm -i /dev/hdx (x=a, b, e) -->to see available values of udma
etc....
When I type something like this:
/sbin/hdparm -u1 -c3 -d1 -X66 /dev/hde
everything seems to be right, typing /sbin/hdparm -Tt /dev/hde improvements come without problem; I've also tried another combinations like -X68 (udma4) (better...),...
It's eassy to do this everytime after booting, but... sincerely I would
like to avoid it. I've included three different lines (one for each hdx) in
/etc/rc.d/rc.local , but it was disastrous...the machine hung while
rebooting, and I had to use the CD1-Installation, enter in "linux
rescue" mode, got a shell as root, searched and edited "rc.local" in
order to deleting 1 (hde) of those three lines; However, booting up I
can see how hda and hdb are set in DMA mode without problems.
I'm only a novice yet! But actually I didn't feel nervous at all!
I've read another comment through a old, long thread outside (googling)
about editing the /etc/rc.d/rc.sysinit , which I suppose that means that
the mentioned settings would be loaded since the fist stage after
booting, is it the difference? Would the result be the same? What could
I do? What am I missing in?
What about to set dma (X mdma2, X mdma1, X mdma0, X sdma1) instead udma
(0,1,...6)? I know that udma is better (at least in theory, isn't it?),
but how much better? Please, I would appreciate some help. I posted this question on the
Shrike-Red-Hat list two weeks ago, and I didn't have any reply, and I
didn't insist on it any more.
Daniel
Daniel - it is hard remembering where everything is half the time. Instead of trying to find the config files you will need all the time, it may be better for you to install webmin.
It has a section for tuning the hard disk parameters and it saves them to the right config files.
Regards, Ed.
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