Thanks for your suggestions on the options for using dd. By the way, is
there a downside to using a greater blocksize for speed (maybe affecting
reliability e.g.) and/or a good reason for the default value being set
to 512 bytes?
And yes, it wouls be really nice to see
https://tails.boum.org/blueprint/backups/#index7h2 being implemented
some time soon:)
--
M
On 2015-03-10 20:03, sycamoreone wrote:
Hi,
I can only say something about some small parts of your questions:
[email protected]:
[...] This means I want to clone a lot of USB sticks, including the
persistent volume! Since this may be a growing use case, it would be
nice to have such a feature in the Tails Installer eventually (maybe
along the lines of
https://tails.boum.org/blueprint/backups/#index7h2), but until then
the solution seems to be something like dd if=/dev/sdX of=/dev/sdY,
sdX being the original prepared Tails USB stick with a preconfigured
persistent volume, and sdY being the USB stick to clone to (obviously
at least as large in size as sdX).
As far as I can see the functionality you want is exactly the same as
the one described in the section you linked to
(https://tails.boum.org/blueprint/backups/#index7h2), even though your
use case is completely different. So it is quite possible that
this gets implemented some day.
[...]
I have tried this successfully once (with two USB sticks of the
exact same model and size) and although it was painfully slow, I
guess I can live with that in lack of a better solution.
Using the 'bs' option for blocksize with dd should make the process a
lot faster. Using dd ... bs=16K means that the program copies blocks of
16 thousand bytes in a single step instead of the default value of 512
bytes. The optimal value depends on your hardware configuration, but
using anything between 16k and 16M will probably be way faster than
using the default value. If you try a few values and compare the output
of dd it should be easy to find a good enough value.
Cheers!
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