From owner-freebsd-hardware Fri Jan 26 12: 4:19 2001 Delivered-To: freebsd-hardware@freebsd.org Received: from mass.dis.org (mass.dis.org [216.240.45.41]) by hub.freebsd.org (Postfix) with ESMTP id DA06837B402 for ; Fri, 26 Jan 2001 12:04:00 -0800 (PST) Received: from mass.dis.org (localhost [127.0.0.1]) by mass.dis.org (8.11.1/8.11.1) with ESMTP id f0QKJkb00775; Fri, 26 Jan 2001 12:19:47 -0800 (PST) (envelope-from msmith@mass.dis.org) Message-Id: <200101262019.f0QKJkb00775@mass.dis.org> X-Mailer: exmh version 2.1.1 10/15/1999 To: Greg Lehey Cc: FreeBSDHW Subject: Re: Hard Drive cloning In-reply-to: Your message of "Fri, 26 Jan 2001 14:02:33 +1030." <20010126140233.C1222@wantadilla.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 26 Jan 2001 12:19:46 -0800 From: Mike Smith Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > >> Have you any suggestions for reasonable values for 'team' to use for > >> dd? > >> > >> I assume the syntax would be: > >> dd bs=NNNNN if=/dev/adNsN | team NNNNN X | dd bs=NNNNN of=/dev/adNsN > > > > That's more or less what I'd recommend. > > > > To take best advantage of FreeBSD's "fast wide pipe" support, the block > > size should be > 64k; I've had good results around 1M. More than that is > > probably wasteful, and may run you out of physical memory... > > More than 128 kB doesn't help much. That's MAXPHYS, the maximum I/O > transfer size. It'll reduce the system call overhead. 8) -- ... every activity meets with opposition, everyone who acts has his rivals and unfortunately opponents also. But not because people want to be opponents, rather because the tasks and relationships force people to take different points of view. [Dr. Fritz Todt] V I C T O R Y N O T V E N G E A N C E To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message