Date: Sat, 26 Sep 2015 10:18:59 -0500 From: Adam Vande More <amvandemore@gmail.com> To: "William A. Mahaffey III" <wam@hiwaay.net> Cc: "FreeBSD Questions !!!!" <freebsd-questions@freebsd.org> Subject: Re: dd question Message-ID: <CA%2BtpaK3UOEfKSfSjbdcH%2BR2jaU9=XVBEg%2B%2Bjn5VCbiiUkLF_Tg@mail.gmail.com> In-Reply-To: <5606A4FF.4090105@hiwaay.net> References: <5606A4FF.4090105@hiwaay.net>
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On Sat, Sep 26, 2015 at 8:59 AM, William A. Mahaffey III <wam@hiwaay.net> 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. -- Adam
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