[nflug] speed imaging netcat

[Brad Bartram]

Run it uncompressed first and then compress it after you have acquired the
image - if you so desire.

In general, imaging is slow.  Maximum you will get about 4GB/s with hardware
dedicated for the task.  That's drive to drive using a SATA connection.
Real world numbers are about 5 hours to image a 500GB drive.

Over a network, it's going to take a much longer time.  First, as I said
before - don't do compression on the fly - do it post capture if you want.
Second, what is your network speed?  Are you at 100 or 1000 Mb/s?  Third,
what is your capture device?  A single drive, a raid array, something else?
How fast is the capture device?  Fourth, check your system logs.  Is your
device giving any errors?  How about your network interface - is that giving
errors?

 Brad

On Mon, Nov 3, 2008 at 12:43 PM, Eric Benoit <eric at bootz.us> wrote:

> *I'm trying to image a ssd drive across the network to my hard drive, I
> used the directions below and everything is working fine, however it is slow
> as time next to a blackhole ;)
>
> does anyone know a way I could speed things up a bit or byte?
>
>
> based on the following instructions:
> *
>
> This method uses dd and nc provided by the Debian Installer and another
> computer located on your local network:
>
>   * First, boot the debian installer on your USB disk
>   * Then be sure to activate network and configure it, same thing for
>     the disk (Do not partition it)
>   * Open a console shell (Alt+F2 or from the Debian Installer menu)
>   * On the backup computer:
>         o get its IP adress (ifconfig)
>         o start a listening nc session on port 9000:
>
> nc -l -p 9000 | gzip -1 -c > ./eeepc.img.gz
>
>   * With netcat-openbsd installed this line should read
>
> nc -l 9000 | gzip -1 -c > ./eeepc.img.gz
>
>   * On the EeePC shell:
>
> dd if=/dev/sda | nc -w 5 computer_ip_adress 9000
>
> Wait some minutes (about 35)... and you get a eeepc.img.gz with about 900Mb
>
> from the website:
> *
> http://tinyurl.com/5hozkf
>
>
> Thank you,
> Eric
> *
> _______________________________________________
> nflug mailing list
> nflug at nflug.org
> http://www.nflug.org/mailman/listinfo/nflug
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.nflug.org/pipermail/nflug/attachments/20081103/d22ecfd4/attachment.html