On Sun, 22 Apr 2001, John Madden wrote:
> Well, first, my technical recommendation: don't do raid5 on IDE unless you
> have a separate controller for each disk - the performance will be really
> bad. :)
eh separate channel ? (all drives are master and no slave's)
> > and i use hdparm -m16 -c1 -d1 -a8 on all hd's
> > so why do i only see 13mb/sec on the ultra33 controller
> > (i thought 28mb/sec would be possible on the ultra33 controller)
> The ATA level is only one factor in determining how much speed you're
> actually going to get. The 33mb/sec, first of all, is 33 *megabits* per
> second, not megabytes -- which is what hdparm gives its measuremants in.
eh sure ?
this will mean :
33 will be limited to 4mbyte/sec
66 will be limited to 8mbyte/sec
but ok, have a look at :
http://www.seagate.com/newsinfo/docs/disc/ultra_ata100_tech_paper.qrk.pdf
(first document i could find)
which tells it's 66.6megabyte/sec for ultra66
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