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8217Re: NSLU2 w/Debian - USB Speed

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  • tleegaard
    Sep 10, 2010
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      --- In nslu2-general@yahoogroups.com, Carl Lowenstein <clowenstein@...> wrote:
      >
      > On Thu, Sep 9, 2010 at 12:36 AM, tleegaard <tleegaard@...> wrote:
      > >
      > >
      > >
      > > Hi there,
      > >
      > > I've problems with the speed rate on the NSLU2. I have attached both an usb-stick and an external HDD to the USB-ports.
      > >
      > > Transfer rates for the usb-stick are ok but as you can see below transfer rates for the HDD is really slow.
      > >
      > > USB-STICK
      > > NSLU:~# dd if=/dev/sda1 of=/dev/null bs=1000 count=10000
      > > 10000+0 records in
      > > 10000+0 records out
      > > 10000000 bytes (10 MB) copied, 1.15959 s, 8.6 MB/s
      > >
      > > EXTERNAL HDD
      > > NSLU:~# dd if=/dev/sdb1 of=/dev/null bs=1000 count=1000
      > > 1000+0 records in
      > > 1000+0 records out
      > > 1000000 bytes (1.0 MB) copied, 2.05157 s, 487 kB/s
      > >
      > > Can anyone suggest a solution to the problem?
      >
      > Make the block size (bs) a multiple of the physical sector size of
      > the disk. (multiple of 512)
      > Otherwise, you are probably reading one (1000-byte) block per
      > revolution, made up of parts of two or three adjacent sectors.
      >
      > carl
      > --
      > carl lowenstein  <clowenstein@...>
      >

      NSLU:~# dd if=/dev/sdb1 of=/dev/null bs=1024 count=1000
      1000+0 records in
      1000+0 records out
      1024000 bytes (1.0 MB) copied, 1.70798 s, 600 kB/s

      I suppose this is what you mean? But I can't see the big difference..
      When transfering to the HDD with SSH/FTP the transfer speed is only about 600-800 kB/s aswell..
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