Re: [PLUG] ATA100 vs ATA66

[epike@isinet.com]

did you try hdparm -I /dev/hdX and hdparm -i /dev/hdX to see
if theyre at the correct udma modes.  Personally I'd play
with hdparm especially the -d -W -c -X switches.  This varies
with the disk and controller (and could crash the disk if 
switched wrong).

on my computer I get readings with a promise ultra tx2 card of:

ultra 100 - peaks at around 24 mb/s
ultra 66  - around 12 mbs

also the linux I installed did not set it up optimally at boot,
so I had to put some hdparm statements in /etc/rc.d/rc.local
to speed up the disk manually.  You should be able to switch
hdparm -X69 for udma100 and -X68 for udma66.  But again that
depends on the disk & controller.

JOndZ






> 
> I got an ATA100 card to replace the ATA66, hoping to get the added advantage
> of the 30G ATA100 drive (2 drives, one is ATA100, the other ATA66). However,
> the hdparm readings indicate that the  buffered-cache reads decreased in
> efficiency and the buffered disk reads pretty much stayed the same.
> 
> All I did was switch the cards. Should I have to reconfigure the kernel to
> load a different module? Does anyone have any experience doing this type of
> thing?
> 
> thanks
> 
> Chris 
> 
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