Re: cloning to multiple drives with the "dd" command.

[Bob Proulx]

Bernhard Voelker wrote:
> didier chavaroche wrote:
> >Executing the "dd" command 23 time leads to transfert rate too low
> 
> Just to be clear (as you didn't show us the commands executed):
> how did you execute the dd command 23 times?
> In parallel, e.g. a background processes?

I was wondering that as well.

Without really knowing what you are doing if it were me not quite
knowing what I was doing I might keep a copy of the source disk in a
tmpfs ram file system and ensure there is enough ram to host it
without swapping.  That would reduce the I/O needed for the source
reducing it to ram accesses.

There is still a bottleneck on the outgoing I/O however.  I expect
that you are completely saturating the bus bandwidth.  If I were doing
that I would consider using multiple systems in order to gain parallel
bus bandwidth.  I would read the source data from the net and write to
the multiple devices spread out over multiple systems.

Bob