From owner-freebsd-questions@freebsd.org Sat Sep 26 14:00:34 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DBE78A089DB for ; Sat, 26 Sep 2015 14:00:34 +0000 (UTC) (envelope-from wam@hiwaay.net) Received: from fly.hiwaay.net (fly.hiwaay.net [216.180.54.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id AF571DD9 for ; Sat, 26 Sep 2015 14:00:34 +0000 (UTC) (envelope-from wam@hiwaay.net) Received: from kabini1.local (dynamic-216-186-213-32.knology.net [216.186.213.32] (may be forged)) (authenticated bits=0) by fly.hiwaay.net (8.13.8/8.13.8/fly) with ESMTP id t8QE0VLw028530 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO) for ; Sat, 26 Sep 2015 09:00:32 -0500 To: FreeBSD Questions !!!! From: "William A. Mahaffey III" Subject: dd question Message-ID: <5606A4FF.4090105@hiwaay.net> Date: Sat, 26 Sep 2015 09:06:01 -0453.75 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Sep 2015 14:00:35 -0000 I am preparing a USB stick for use to install FreeBSD 9.3R on 2 new boxen I am bringing online. I already had the FreeBSD 9.3R img dd'ed to that stick last year when I provisioned this box, but for some reason, when I plugged the stick into my USB port today to copy some additional files to it (scripts to be used during installs to partition & slice up HDD's), I got errors in my syslog file & couldn't mount the drive for the copies. No problema, I'll just re-dd the image to the device & start over, all I would lose is output from the previous install (this box, last year this time). However, I notice the dd is proceeding *VERY* slowly: [root@kabini1, /etc, 8:47:59am] 508 % ll /dev/da0* crw-r----- 1 root operator 0xd2 Sep 26 08:29 /dev/da0 crw-r----- 1 root operator 0xcd Sep 26 08:29 /dev/da0a [root@kabini1, /etc, 8:48:09am] 509 % ll /net/q6600/home/ISOs/BSDs/FreeBSD/9.3/ total 1530556 -rw-r--r-- 1 wam users 178749440 Jul 26 2014 FreeBSD-9.3-RELEASE-amd64-bootonly.iso -rw-r--r-- 1 wam users 671152128 Jul 26 2014 FreeBSD-9.3-RELEASE-amd64-disc1.iso -rw-r--r-- 1 wam users 717373440 Jul 26 2014 FreeBSD-9.3-RELEASE-amd64-memstick.img -rw------- 1 wam users 811 Jul 26 2014 checksum.MD5.txt [root@kabini1, /etc, 8:48:19am] 510 % dd if=/net/q6600/home/ISOs/BSDs/FreeBSD/9.3/FreeBSD-9.3-RELEASE-amd64-memstick.img of=/dev/da0 94834+0 records in 94834+0 records out 48555008 bytes transferred in 542.035379 secs (89579 bytes/sec) 101599+0 records in 101599+0 records out 52018688 bytes transferred in 580.466607 secs (89615 bytes/sec) I got that output by sending the SIGINFO signal to the dd process from another shell window. My question is: Why so slow (89-ish KB/s) ? I have gigabit switched LAN (125 MB/s theoretical speed), & most other file copies or rsyncs across the LAN go at about 1/3 - 1/2 of theoretical speeds, which is AOK by me. Any ideas ? TIA & have a nice weekend. -- William A. Mahaffey III ---------------------------------------------------------------------- "The M1 Garand is without doubt the finest implement of war ever devised by man." -- Gen. George S. Patton Jr.