From owner-freebsd-questions Tue Jan 6 18:08:14 1998 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id SAA23221 for questions-outgoing; Tue, 6 Jan 1998 18:08:14 -0800 (PST) (envelope-from owner-freebsd-questions) Received: from Kitten.mcs.com (Kitten.mcs.com [192.160.127.90]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id SAA23203 for ; Tue, 6 Jan 1998 18:08:11 -0800 (PST) (envelope-from font@Mars.mcs.net) Received: from Mars.mcs.net (font@Mars.mcs.net [192.160.127.85]) by Kitten.mcs.com (8.8.7/8.8.2) with ESMTP id UAA08693 for ; Tue, 6 Jan 1998 20:08:09 -0600 (CST) Received: from localhost (font@localhost) by Mars.mcs.net (8.8.7/8.8.2) with SMTP id UAA25863 for ; Tue, 6 Jan 1998 20:08:09 -0600 (CST) Date: Tue, 6 Jan 1998 20:08:09 -0600 (CST) From: Font To: questions@freebsd.org Subject: How best to speed up rdumps? Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk I'm dumping across a network to an Exabyte 8505, and while backups on the FreeBSD 2.2.2+ machine seem to go at 300-600Kbyte/s typically, backups across the network (from a 2.2.1R machine, so far) seem to only be getting around 50Kbyte/s. The network is 10baseT with a smattering of 100baseTX, and is fairly calm at the time of backup. The command I'm using is dump 0auf tapeserverbox:/dev/nrst0 filesys Should I be specifying a blocksize when doing backups over the network? If so, how would I go about selecting an ideal blocksize? Would I need to do several test dumps to determine this? Or should I be looking into something else for the bottleneck? The odd thing is, I did pretty much the same thing when backing up a NEXTSTEP 3.3p1 box to a FreeBSD box, and was still able to get over 300 Kbyte/s. Admittedly it was a different and even less-loaded network to a different tape drive (WangDAT 3400DX), but I guess I expected more throughput between like systems. A bug in my MUA causes news.announce.newusers font to be sent to beneficiaries and senders of UCE/SPAM. @ mcs.net Wishes are like dishes.