From owner-freebsd-questions  Fri Oct  5  5:44:47 2001
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From: "Magdalinin Kirill" <bsdforumen@hotmail.com>
To: simon@optinet.com, freebsd-hardware@freebsd.org
Cc: questions@freebsd.org
Subject: Re: Re: turning off write cache on SCSI drive
Date: Fri, 05 Oct 2001 16:44:36 +0400
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>What controller are you using? most allow you to do this
>from their BIOS.

It's an Adaptec SCSI BIOS v3.00 on ASUS P2B-DS Revision 1013
to which I upgraded from some older version and there is
no such feature.

Anyway, the drive seems to keep write cache off that I set
via Mylex AcceleRAID 352 on another box, because the setting
is disabled under Win2K even though Fujitsu support says it
would be switched on again after restart.

I did find exac command for switching cache
("camcontrol modepage daX -m 8 -e"), but it seems to be
only writeable, because according to vi launched with
that command both write and read cache are disabled after
each restart.

regards,

Kirill Magdalinin,
bsdforumen@hotmail.com


>From: "Simon" <simon@optinet.com>
>Reply-To: "Simon" <simon@optinet.com>
>To: "freebsd-hardware@freebsd.org" <freebsd-hardware@freebsd.org>, 
>"Magdalinin Kirill" <bsdforumen@hotmail.com>
>CC: "questions@freebsd.org" <questions@freebsd.org>
>Subject: Re: turning off write cache on SCSI drive
>Date: Thu, 04 Oct 2001 11:06:17 -0400
>
>
>What controller are you using? most allow you to do this
>from their BIOS. Otherwise, as you said, you can use
>camcontrol. Search the mail archives for write cache off,
>you will find posting that give exact command.
>
>-Simon
>
>On Thu, 04 Oct 2001 19:01:21 +0400, Magdalinin Kirill wrote:
>
> >Hello,
> >
> >some mail posts on softupdates says that turning off write cache is
> >prerequisite for it.
> >
> >How can I accomplish it on freebsd? As far as I know
> >there is camcontrol utility, but it's usage is quite
> >difficult for me to understand.
> >
> >I stuck the drive into another box and turned off
> >write cache using raid controler bios setup, but
> >it's uclear if this setting is still active.
> >
> >The other way I can think of it is turning it off
> >under Win2K. Yet how can I check write cache status
> >under FreeBSD?
> >
> >thanks,
> >
> >Kirill Magdalinin
> >bsdforumen@hotmail.com
> >
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