fastest raw device copy?

Ivan Voras ivoras at freebsd.org
Fri Oct 31 08:03:20 PDT 2008


Christoph Kukulies wrote:

> OK, I understand that 10000000 isn't good, I just thought it wouldn't
> harm. But if it is a transfer rate killer then I'd better think of
> typing ^C now. The command is running for 6 hours now.

No, with a size that isn't a multiple of sector sizes your transferred
data will be corrupted. Actually, it's surprising that your number even
works - the system should have complained when you requested that size
for bs.

> An idea how I can check the current amount of transfered byed alongside
> the running dd command? Or watch the current i/o rate?

hit Ctrl-T while running dd.

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