Re: Writing to a usb-device
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On Friday 06 June 2003 03:24 am, Johann Spies wrote:
> I apologise for a longish message.
>
> I bought myself a device in which you can put an ide-device an which
> communicates with the computer through a usb-interface. I put a 60 Gb
> hard disk and partitioned it into three normal partition (2xreiserfs
> and 1 ext3) and a swap partition.
>
> My first experiment was to make a local debian mirror using debmirror
> - and I did not have any problems as I was downloading it from an
> ftp-site in our network with a download speed of below 1 Mb.
>
> I do have some problems with it when copying larger amounts of data
> from normal hard disks to the device.
>
> At home I have a 364Mhz Celeron with 64 Meg ram and I experience a
> high load average when I write to the usb-device.
>
> Using rsync to copy a partition to the usb-device stalled the computer
> at the stage when it was copying iso-images. During one effort there
> were usb timeout-errors. That also happened when I tried to do it
> using "find $1 -depth -xdev -print | cpio -dumpv
> $2". I then experimented with buffer in the following way:
>
> find $1 -depth -xdev -print | buffer -u 100 | cpio -dumpv $2
>
> and I could copy the iso-images without problems although it was slow.
>
> I don't think I can use "buffer" with rsync - or can I?
>
> Now my questions:
>
> 1. Which is the best way to copy large amounts of data to a usb-device?
> 2. How can I install Debian on such a device?
> 3. hdparm would not work on the device (mounted as a scsi device).
> How can I improve the transfer rate?
Are you using USB 1 or 2 ? USB 1.x would seem slow for disk to disk
transfers.
- --
Greg Madden
Debian GNU/Linux
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