On 11/1/22 11:13, Roger Heflin wrote:
I usually add a bs=4k or bs=16k or a bs=256k when using dd so the
blocksize is larger.  That usually makes it quite a bit  faster.

I usually use at least bs=1M.

And if you background the dd you can use "vmstat 1" and the bi/bo
columns tell you the actual disk io rates, and you can use that to
reliably estimate.

A much more friendly disk speed option is "iostat 5" (the 5 is how many seconds between updates).

You can also use "status=progress" as a dd option.

Why would you background dd versus using a second terminal tab?
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