[Novalug] need dd help

Jay Hart jhart@kevla.org
Mon Feb 13 00:04:28 EST 2012


I can't seem to get a valid volume going under FreeNAS, so I'm resorting to
removing all data on the drive, followed by a system reboot to see if this
clears my issue.

Jay

> There is a live CD called Darik's Boot and Nuke (DBAN) that will do
> this for you with varying algorithms, and can also achieve DoD and
> NIST standards for data destruction, if that's your goal. It may be
> easier than doing this.
>
> http://www.dban.org/
>
> On Sun, Feb 12, 2012 at 23:27, Soren Harward <stharward@gmail.com> wrote:
>> On Sun, Feb 12, 2012 at 10:28 PM, Jon LaBadie <novalugml@jgcomp.com> wrote:
>>> I find when making large transfers like this that a
>>> larger buffer size greatly speeds up dd.  I'd suggest 4k.
>>
>> I've found that most block devices run faster with blocks even larger
>> that 4k; but if you go too large, then the rate starts dropping again.
>>  If you're trying to zero out a 1TB drive, I'd suggest adding the
>> option "count=1000" and trying several different 2^n block sizes to
>> find the optimal transfer rate.  My version of dd conveniently prints
>> the transfer rate when it's finished.  My hard drive is about 30%
>> faster with 32k blocks than with 4k blocks.
>>
>> --
>> Soren Harward
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>
>
>
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