Funny because it is in my manual.  Let me quothet:

FILES

     /dev/sdup      block mode SCSI disk unit u, partition p

     /dev/rsdup     raw mode SCSI disk unit u, partition p
You have been told by several people that you are doing it wrong.  Those

people are the ones who wrote part of this fine OS.  Maybe you should

take a hint when you get one.  Let me repeat it again for you: you are

doing it wrong.
I can install this OS in 5 minutes in 1 go.  If you need 33 installs to

figure this out your process might be flawed.  On top of that ignorance

you also are unfriendly but this gets back to your flawed process.
You have lots of reading to do.  Read the FAQ and other fine online

manuals.  If it doesn't work for you after this amount of time I am

afraid OpenBSD isn't for you.  You might want to consider a different

OS.
On Tue, Aug 26, 2008 at 10:07:43AM -0700, Neko wrote:

quoted text
> > You are

> > proving nothing with this test.

>

> iv check the manuals and take a hint : raw dev arent in there

> so low your row

>

> ill check it , i think after a think thank of 3x72 hours straight 33x install 6 os you would start and think.

>

> You havent proving me that you read my question

>

> neko

>

>

> --- On Tue, 8/26/08, Marco Peereboom  wrote:

>

> > From: Marco Peereboom

> > Subject: Re: dd performance question

> > To: "Neko"

> > Cc: misc@openbsd.org

> > Date: Tuesday, August 26, 2008, 8:07 AM

> > These types of tests should be run against the raw device.

> > You are

> > proving nothing with this test.

> >

> > On Mon, Aug 25, 2008 at 06:58:30PM -0700, Neko wrote:

> > > Hi all,

> > >

> > > having a 250 GB drive on a PATA strip using lowest PIO

> > mode (without dma if possible), drive specs show a 8 MB

> > buffer ,

> > >

> > > 2 cases are : on same pata strip,  one on each strip,

> > >

> > > important to note that the booted drive is the

> > if's straight up to my slave.

> > > (yea i know ill have to run fsck afterwards since itll

> > think it still mounted)

> > > and having no user but su himself.

> > >

> > > i had ran mine at 4mb block space thinking ill use the

> > 16mb bus transfer

> > > divided at most in 4, per second, but i achieved that

> > in a minute instead.

> > > this is really poor performance,  3 days for 250gb

> > transfer at 4mb bs

> > >

> > > dd if=/dev/wd0c of=/dev/wd1c bs=4m

> > >

> > > so what if i was to use

> > >

> > > dd if=/dev/wd0c of=/dev/wd1c bs=4000m

> > >

> > > or more, or reflecting number sector divided by lets

> > say 16... would in

> > > the end i get the same effect,  what are the plateau i

> > should top of,

> > > a mb is way too cheezy

> > >

> > > i have 512mb of ram, would 512mb be the most ? the

> > machine is idling either way.

> > >

> > >

> > > neko