Date: Thu, 23 Jul 2009 15:07:35 -0700 From: Drew Tomlinson <drew@mykitchentable.net> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-current@freebsd.org, erich@apsara.com.sg Subject: Re: USB 2.0 External Drive - What Is A Reasonable Transfer Rate? Message-ID: <4A68DF27.3050303@mykitchentable.net> In-Reply-To: <200907231004.37704.hselasky@c2i.net> References: <4A67CD2B.9040200@mykitchentable.net> <200907231004.37704.hselasky@c2i.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Hans Petter Selasky wrote: > On Thursday 23 July 2009 04:38:35 Drew Tomlinson wrote: > >> I have a USB 2.0 external drive that's formatted as NTFS under Windows >> XP. I've plugged it into my 8.0 BETA2 install and am copying files to a >> local raid1z zpool with one vdev consisting of 4 drives. I'm trying to >> move about 100 GB of assorted files and have been at it all day. The >> USB drive contains assorted files such as mp3, CD/DVD images, zip, >> documents, etc. I'm guessing most files range between 1 - 4 MB with >> some as large as 4 GB. >> >> Anyway, iostat shows the transfer rate at around 2 - 3 MB per second. >> Is this all I should expect from a USB 2.0 drive? Is there anything I >> can do to speed this up? >> > > Hi, > > Benchmark your device like this: > > dd if=/dev/daX of=/dev/null bs=65536 > > It will give you the correct transferrate number. > Thanks. When using your suggestion, iostat shows rate at almost 34 MB per second which seems reasonable. When copying a large file to /dev/null as suggested by Erich Dollansky, I get right around 10 MB per second. So does that mean that it's the NTFS driver that's causing the slowing? > Maybe there are some utilities in /usr/ports that can read NTFS faster than > the kernel NTFS driver. > Maybe I'll have a look at /usr/ports/sysutils/fusefs-ntfs as suggested by Gary Jennejohn. Thanks, Drew -- Be a Great Magician! Visit The Alchemist's Warehouse http://www.alchemistswarehouse.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4A68DF27.3050303>