From owner-freebsd-scsi Thu Jul 2 18:00:28 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id SAA09663 for freebsd-scsi-outgoing; Thu, 2 Jul 1998 18:00:28 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from misery.sdf.com (misery.sdf.com [204.244.213.49]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id SAA09645 for ; Thu, 2 Jul 1998 18:00:05 -0700 (PDT) (envelope-from tom@sdf.com) Received: from tom by misery.sdf.com with smtp (Exim 1.82 #3) id 0yrtgi-0001La-00; Thu, 2 Jul 1998 17:26:52 -0700 Date: Thu, 2 Jul 1998 17:26:52 -0700 (PDT) From: Tom To: wjw@iaehv.nl cc: scsi@FreeBSD.ORG Subject: Re: Using a DPT controller, pros and cons In-Reply-To: <199807022249.AAA06671@surf.IAE.nl> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, 3 Jul 1998, Willem Jan Withagen wrote: > You ( Tom ) write: > => > => On Thu, 2 Jul 1998, Willem Jan Withagen wrote: > => > => > The other issue: > => > I've done 3 'dd if=/dev/zero of=/mnt?/bar' in parallel on the > => > => What blocksize? > > Just the dd-default. Would that matter in what I observe? I was just trying > to see if I understand this box. :-) A small block size can mean lots of extra SCSI commands (one per block), which adds a lot of extra overhead, and since your bus is only operating at 5mhz, that can be pretty bad. Try "bs=64k". Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message