Date: Thu, 2 Jul 1998 17:26:52 -0700 (PDT) From: Tom <tom@sdf.com> To: wjw@iaehv.nl Cc: scsi@FreeBSD.ORG Subject: Re: Using a DPT controller, pros and cons Message-ID: <Pine.BSF.3.95q.980702172539.4067B-100000@misery.sdf.com> In-Reply-To: <199807022249.AAA06671@surf.IAE.nl>
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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
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