From owner-freebsd-questions Mon Nov 19 18:58:58 2001 Delivered-To: freebsd-questions@freebsd.org Received: from mail.wolves.k12.mo.us (mail.wolves.k12.mo.us [207.160.214.1]) by hub.freebsd.org (Postfix) with ESMTP id 2316E37B405; Mon, 19 Nov 2001 18:58:55 -0800 (PST) Received: from mail.wolves.k12.mo.us (cdillon@mail.wolves.k12.mo.us [207.160.214.1]) by mail.wolves.k12.mo.us (8.9.3/8.9.3) with ESMTP id UAA13752; Mon, 19 Nov 2001 20:58:45 -0600 (CST) (envelope-from cdillon@wolves.k12.mo.us) Date: Mon, 19 Nov 2001 20:58:45 -0600 (CST) From: Chris Dillon To: Christopher Farley Cc: Greg Lehey , Subject: Re: Slow restores on a DLT4000 In-Reply-To: <20011119200058.B92015@northernbrewer.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, 19 Nov 2001, Christopher Farley wrote: > Oh yeah, soft updates are not enabled, but I plan to fix that > soon. And a `restore -N` (with no disk writes -- don't know about > metadata updates) takes just as long as a regular restore. It sounds like you aren't using a large enough block size. The documentation for your drive should mention a minimal block size to use to be able to stream data constantly. I think it is at least 32KB for most DLT drives. IIRC, I'm using a 64KB or 128KB block size on my DLT1 at work (albeit with Windows NT). Running systat -vmstat and watching sa0 in the "Disks" section will tell you what block size is actually being used. -- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net FreeBSD: The fastest and most stable server OS on the planet - Available for IA32 (Intel x86) and Alpha architectures - IA64, PowerPC, UltraSPARC, and ARM architectures under development - http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message