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From: mickey@cantina.clinet.fi (Mika Ruohotie)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Adaptec 2940UW works *but* ...
Date: 10 Dec 1996 10:11:11 +0200
Organization: Clinet, Espoo, Finland
Lines: 37
Message-ID: <58j5uv$h55@cantina.clinet.fi>
References: <32AC10E0.41C67EA6@jnet.vi>
NNTP-Posting-Host: cantina.clinet.fi
NNTP-Posting-User: mickey
In article <32AC10E0.41C67EA6@jnet.vi>, John Lucas <jlucas@jnet.vi> wrote:
>After much trial and error, I was able to get FreeBSD v2.1.5-RELEASE to
>work with the Adaptec 2940UW (PCI Ultra Wide) host adapter and the
>Seagate ST32155W (Hawk XL 2GB Ultra Wide drive). The secret is use the
>"dangerously dedicated" drive partitionining. Although I tried many
>things I was not able to get FreeBSD to install (and boot) properly any
>other way. Now I have a system with a theoretical transfer rate of
>40MB/sec (!!).
hmm? i've used 2940UW and 3940UW (differential even) for months, with
several versions, last is with 2.1.5 (soon something else), several
different drives, and havent yet seen _any_ problems...
and well, with one drive, and coz of the physic laws, you can not go
anywhere near 40MB/sec, that's the maximum _scsibus_ speed you can have,
i think you need about 5 hawks to get to the, again, physical limit
(which comes from the clock speeds) ~32MB/sec... feel free to correct
if that wasnt true... (can someone again tell me the way to calculate this?
i remember reading articles that talk about spinning speeds and the
amounts that it's possible to "drag" off from the disk, did depend the
inner/outer sectors)
but remember that the speed is sustained value, the whatever-eide speeds
which are being advertised are always burst values. _big_ difference.
and... neener neener, i use 3940, _dual channel_ UW... :p
> - When attempting to use default partitioning with FreeBSD using the
why not use the default?
still i remember using undefaults too and _yet_ having no problems...
mickey
--
mika ruohotie mika@aeon.net