From owner-freebsd-hackers Fri May 8 11:33:48 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id LAA09425 for freebsd-hackers-outgoing; Fri, 8 May 1998 11:33:48 -0700 (PDT) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from misery.sdf.com (misery.sdf.com [204.244.213.32]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id LAA09383 for ; Fri, 8 May 1998 11:33:28 -0700 (PDT) (envelope-from tom@sdf.com) Received: from tom by misery.sdf.com with smtp (Exim 1.82 #3) id 0yXrXF-0001NT-00; Fri, 8 May 1998 11:06:17 -0700 Date: Fri, 8 May 1998 11:06:15 -0700 (PDT) From: Tom To: Wilko Bulte cc: Terry Lambert , kpielorz@caladan.tdx.co.uk, beng@lcs.mit.edu, dec@phoenix.its.rpi.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: dump/restore problem (was: Network problem with 2.2.6-RELEASE) In-Reply-To: <199805081641.SAA12479@yedi.iaf.nl> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Fri, 8 May 1998, Wilko Bulte wrote: > DLTs need blocksizes >= 64 Kb to be kept happy streaming. I used a DLT2000 > for years on my FreeBSD box, I now have a DLT4000. I can't keep 'm streaming > from a 4G Barracuda with the current 64kB physio() limit. Keep the tape and > the disks on seperate SCSI channels (I have 2x NCR810). > > I've never even *owned* a IDE disk, let alone used one on my system so I > cannot comment on what this might do with DLT drives. Well, my DLT 4000 drive has a 2MB buffer, and I've never had a problem making it stream properly. Some backup situtions (tar on a fileystem with lots of small files) are probably going troublesome, but that can be avoided by using something like star, which uses a double-buffer arragement. Some have reported that star is faster than dump. Well, IDE is automatically not using the SCSI bus, so there is no problem there. So if they are reasonable drives, it should work. I get about 5MB/s filesystem performance, which isn't great, but more than enough to keep a DLT4000 busy. > Wilko > _ ______________________________________________________________________ > | / o / / _ Bulte email: wilko @ yedi.iaf.nl > |/|/ / / /( (_) Arnhem, The Netherlands WWW: http://www.tcja.nl > ______________________________________________ Powered by FreeBSD __________ Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message