On 09/04/17 18:06, Richard Kettlewell wrote:
> The Natural Philosopher  writes:
>> On 09/04/17 17:16, Raymond Wiker wrote:
>>> Ahem A Rivet's Shot  writes:
>>>
>>>> On Sat, 08 Apr 2017 19:46:53 -0700
>>>> "DisneyWizard the Fantasmic!"  wrote:
>>>>
>>>>> [SOLVED] {dd if=/dev/sdb of=/dev/sda &} duplicates terabyte drives.
>>>>
>>>>  It will go much faster with bs=64k added to the arguments.
>>>
>>> Probably even faster with (a little higher) blocks... and using raw
>>> devices (/dev/rsd{a,b}) may also help.
>>>
>> ls -l /dev/rs*
>> ls: cannot access /dev/rs*: No such file or directory
>>
>> In fact e raw devices are IIRC /dev/sd[abcd] etc.
>> The partitions are /dev/sd[abcd][12345...]
>
> In Linux raw devices means the cache is bypassed; see ‘man raw’. For
> this application I wouldn’t bother.
>
Ah. wasn't aware of that semantic. I've always used 'raw' to refer to
'unpartitioned' on block devices.

--
If you tell a lie big enough and keep repeating it, people will
eventually come to believe it. The lie can be maintained only for such
time as the State can shield the people from the political, economic
and/or military consequences of the lie. It thus becomes vitally
important for the State to use all of its powers to repress dissent, for
the truth is the mortal enemy of the lie, and thus by extension, the
truth is the greatest enemy of the State.

Joseph Goebbels

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