Date: Mon, 19 Nov 2001 20:58:45 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Christopher Farley <chris@northernbrewer.com> Cc: Greg Lehey <grog@FreeBSD.ORG>, <questions@FreeBSD.ORG> Subject: Re: Slow restores on a DLT4000 Message-ID: <Pine.BSF.4.32.0111192049250.13508-100000@mail.wolves.k12.mo.us> In-Reply-To: <20011119200058.B92015@northernbrewer.com>
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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
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