On Saturday 08 September 2001 06:49 pm, Joan Tur escribió:
> Es Divendres 07 Setembre 2001 14:03, en Jeremy Davidson va escriure:
> > I have an IBM Deskstar 75GXP 30GB drive which is ATA100 compatible,
> > but I have a feeling that MDK8.0 is not taking full advantage of
> > this feature. My motherboard, an Asus A7A266, also supports this.
> >
> > A line showed up during installation (might during boot-up too --
> > haven't checked) that says ide bus is assumed to be running at
> > 33Mhz, and it gives some variable name to use for changing it.
>
> Well... bus is really running at 33mhz. Check using dmesg command
> and report here! };)
>
> ATA33, ATA66 and ATA100 all are running on the same PCI slot...
Very true, no matter what the HDD, whether SCSI, ATA /33, /66/or
/100 they all still run on the 33.3mhz PCI bus.
BUT, to help out Jeremy, I'd suggest using hdparm to set the drives
to their best UDMA mode the total system can handle.
So, 'hdparm -i /dev/hd?' (as root, substitute the proper drive
letter for ?) will display the UDMA modes your drive is capable of.
Then you can add lines at the end of '/etc/rc.d/rc.local' so that your
drive(s) will be optimized at boot.
For example:
hdparm -c1 -d1 -X68 /dev/hda <-- [ turns on 32 bit, DMA, and sets this
drive to UDMA4 (ATA/66)]
hdparm -c1 -d1 -X69 /dev/hdb <-- [ turns on 32 bit, DMA, and sets this
drive to UDMA5 (ATA/100)]
see 'info hdparm' for full information
CAUTION: the 2nd example I gave enables UDMA5 and ATA/100. BUT your
HDD performance is not just a function of the HDD. As with anything,
the rest of the system is involved also. IE, cpu/cache/ram/motherboard/
chipset, cables, power supply, cooling, kitchen sink, etc. Even tho
you might have an ATA /100 capable drive, doesn't mean the rest of your
system can handle it. Setting ATA / UDMA too high on marginal hardware
can cause data loss, and/or corruption, even failure.
hdparm won't sort all this out for you, it's your responsibility.
OTOH, ATA/100 is obsolete. Google 'Serial ATA' ;~>>
--
Tom Brinkman Galveston Bay
Want to buy your Pack or Services from MandrakeSoft?
Go to http://www.mandrakestore.com
