Date: Fri, 3 Jul 1998 09:40:21 +0200 (MET DST) From: Willem Jan Withagen <wjw@surf.IAE.nl> To: tom@sdf.com (Tom) Cc: wjw@iaehv.nl, scsi@FreeBSD.ORG Subject: Re: Using a DPT controller, pros and cons Message-ID: <199807030740.JAA04676@surf.IAE.nl> In-Reply-To: <Pine.BSF.3.95q.980702172539.4067B-100000@misery.sdf.com> from Tom at "Jul 2, 98 05:26:52 pm"
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You ( Tom ) write: => => 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". I get your point, but as I'm trying to get this system worked out. Your remarks lead me to keep it at default blocks. :-) It keeps the system more in stressed state, and thus errors show up more easily. --WjW -- Internet Access Eindhoven BV., voice: +31-40-2 393 393, data: +31-40-2 606 606 P.O. 928, 5600 AX Eindhoven, The Netherlands Full Internet connectivity for only fl 12.95 a month. Call now, and login as 'new'. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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