From owner-freebsd-questions@freebsd.org Sun Sep 27 00:32:25 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 9FF5BA0879C for ; Sun, 27 Sep 2015 00:32:25 +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 7113A260 for ; Sun, 27 Sep 2015 00:32:24 +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 t8R0WMUG024815 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO) for ; Sat, 26 Sep 2015 19:32:23 -0500 Subject: Re: dd question References: <5606A4FF.4090105@hiwaay.net> Cc: FreeBSD Questions !!!! From: "William A. Mahaffey III" Message-ID: <56073915.6030707@hiwaay.net> Date: Sat, 26 Sep 2015 19:37:51 -0453.75 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; 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: Sun, 27 Sep 2015 00:32:25 -0000 On 09/26/15 10:25, Adam Vande More wrote: > On Sat, Sep 26, 2015 at 8:59 AM, William A. Mahaffey III > wrote: > >> >> 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. >> > Hitting Ctrl-T in the dd terminal is a lot easier. > > >> My question is: Why so slow (89-ish KB/s) ? >> > Well first off I'd tell dd to use a bigger bs like 1m. > > Update: I tried the dd again w/ 'bs=1m' & it worked much faster: [root@kabini1, /etc, 7:30:31pm] 535 % dd if=/net/q6600/home/ISOs/BSDs/FreeBSD/9.3/FreeBSD-9.3-RELEASE-amd64-memstick.img of=/dev/da0 bs=1m ^T 359+0 records in 359+0 records out 376438784 bytes transferred in 107.540613 secs (3500434 bytes/sec) 424+0 records in 424+0 records out 444596224 bytes transferred in 127.134420 secs (3497056 bytes/sec) 684+1 records in 684+1 records out 717373440 bytes transferred in 208.189064 secs (3445779 bytes/sec) [root@kabini1, /etc, 7:34:08pm] 536 % The 'ctrl-T' did not in fact return anything, but the 'killall -SIGINFO dd' from another shell window did. 3.4-ish MB/s is quite usable, so all appears well. -- William A. Mahaffey III ---------------------------------------------------------------------- "The M1 Garand is without doubt the finest implement of war ever devised by man." -- Gen. George S. Patton Jr.