In my case, I needed to make an exact image of the
source drive, so I felt dd was the appropriate tool.
I don't remember the bs - perhaps 1k?
Thanks for the hint.
JD
--- Matt Graham <
danceswithcrows@usa.net> wrote:
> From: Jorge Delacruz <alterthegrid@yahoo.com>
> > Matt Graham <danceswithcrows@usa.net> wrote:
> > > 2M/s? That doesn't sound right for either USB1
> or USB2.
> > I plugged in a USB drive and [dd'ed] the internal
> drive to
> > a file on the external USB drive. It took 9 hours
> to dd a
> > 40 GB internal drive, so 1.2 MB/sec
>
> What did you specify for bs= ? 32k or 64k would
> have probably
> worked the best. If you don't specify a bs= , dd
> reads and
> writes 512-byte blocks. This is ... suboptimal, as
> 64 reads of
> 0.5K take much longer than 1 read of 32K.
>
> > I used USB2 hardware. Maybe this is a limitation
> with dd?
> > The external hard drive's light blinks a lot and
> the box
> > seems I/O bound when I do it.
>
> Of course it's going to be I/O bound; you're doing a
> whole
> bunch of I/O. See above for a possible explanation.
> Also,
> dd is the stupidest backup method in existence as it
> copies
> everything including blocks that aren't in use. Use
> partimage
> or tar or rsync; that's what they're there for.
>
>
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