using 'dd' from one source to multiple destinations

[Lennart Sorensen]

On Mon, Jan 24, 2005 at 05:10:57PM +0000, Robert Brockway wrote:
> What is wrong with this?
> 
> DISKS="sdb sdc sdd"
> for I in $DISKS
> do
> 	dd if=/dev/sda of=/dev$I &
> done
> 
> This is actually more typing than repeating the dd command manually.
> 
> One assumes the originating filesystem is not changing during the process.
> If it is (which would be undesirable) better alternatives exist, such as:
> 
> dd if=/dev/sda of=/dev/sdb
> dd if=/dev/sdb of=/dev/sdc
> dd if=/dev/sdc of=/dev/sdd

It takes 3 times longer than reading onces and writing all others in
parallel.

Lennart Sorensen
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