Date: Thu, 23 Jul 2009 10:04:36 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-current@freebsd.org Cc: Drew Tomlinson <drew@mykitchentable.net> Subject: Re: USB 2.0 External Drive - What Is A Reasonable Transfer Rate? Message-ID: <200907231004.37704.hselasky@c2i.net> In-Reply-To: <4A67CD2B.9040200@mykitchentable.net> References: <4A67CD2B.9040200@mykitchentable.net>
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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. Maybe there are some utilities in /usr/ports that can read NTFS faster than the kernel NTFS driver. --HPS
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