Mailinglist Archive: opensuse (1556 mails)

[Greg Freemyer <greg.freemyer@xxxxxxxxx>]

On Wed, Feb 3, 2010 at 4:52 AM, Sampsa Riikonen <sampsa.riikonen@xxxxxx> wrote:
> Dear List,
>
> A question concerning data backups and transfer speed..
>
> I am trying to do a backup using
>
> dd if=/dev/sda of=/dev/sdb
>
> From my internal hard disk to an external usb hard disk
> (i.e. I am just dumping the disk image to an empty disk).
> I am doing this, of course, while the filesystems are unmounted.
>
> I imagine that the bottleneck is the usb (2.0) connection.
> What I read from wikipedia, the speed of that is..
>
> 60 Mbytes (not bits) per second ~ 0.06 Gbytes per second
>
> So this means that a 500 Gbytes hard disk should copy in aprox. 2.3 hours
>
> .. but know it seems it takes more than 24 hours!

I use usb-2 a fair amount.  You should expect 1GB/min or 60GB/hr in
the real world.  So 8 or 9 hrs would be more typical.

No idea why your running slow.

Greg
-- 
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse+help@xxxxxxxxxxxx