From owner-freebsd-hardware Thu Jan 30 15: 3:56 2003 Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 76AD937B401 for ; Thu, 30 Jan 2003 15:03:55 -0800 (PST) Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by mx1.FreeBSD.org (Postfix) with ESMTP id A782543F75 for ; Thu, 30 Jan 2003 15:03:54 -0800 (PST) (envelope-from ken@panzer.kdm.org) Received: from panzer.kdm.org (localhost [127.0.0.1]) by panzer.kdm.org (8.12.6/8.12.5) with ESMTP id h0UN3mnU067161; Thu, 30 Jan 2003 16:03:48 -0700 (MST) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.12.6/8.12.5/Submit) id h0UN3mmn067160; Thu, 30 Jan 2003 16:03:48 -0700 (MST) (envelope-from ken) Date: Thu, 30 Jan 2003 16:03:48 -0700 From: "Kenneth D. Merry" To: joe mcguckin Cc: hardware@FreeBSD.ORG Subject: Re: DLT tape not streaming Message-ID: <20030130160348.A67127@panzer.kdm.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from joe@via.net on Thu, Jan 30, 2003 at 02:50:45PM -0800 Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Thu, Jan 30, 2003 at 14:50:45 -0800, joe mcguckin wrote: > Our DLT-7000 tape drive does not stream continuously - there's quite a bit > of shuttling back and forth. > > Are there any SCSI parameters I can tweak to improve it's performance? What are you using to do backups? dump(8) is notoriously inefficient; I would recommend using Matt Dillon's caching tweaks to dump (use the -C option). They'll probably speed things up somewhat. Another option is dumping the whole thing to a file, and then use dd to send that dump image to the tape drive. I use that technique on a number of machines. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message