[dm-crypt] mistake with luksFormat

A. Kapetanovic aka at alphanet.ch
Sat Dec 23 18:22:11 CET 2017


Thanks Arno,

If I have good understood, you think I can throw the HDD ? This command

cryptsetup -y -v luksFormat /dev/sdb

Simply destroys the drive ?

(I didn't ask any other operations on the sdb).

Regards,

Amel


Arno Wagner writes:

> Hi Amel,
>
> I would say your disk died while you were doing the overwrite.
> That is assuming nothing the OS uses was on sdb.
> There is no logout-timer in ssh and anyways, it would not freeze.
>
> Regards,
> Arno
>
>
> On Sat, Dec 23, 2017 at 11:49:22 CET, A. Kapetanovic wrote:
>> Hi everybody,
>>
>> I did something wrong, can please someone help me ? I followed these
>> instructions to encrypt a internal HDD :
>>
>> https://www.cyberciti.biz/hardware/howto-linux-hard-disk-encryption-with-luks-cryptsetup-command/
>>
>> Unfortunately I did
>>
>> cryptsetup -y -v luksFormat /dev/sdb
>>
>> and not
>>
>> cryptsetup -y -v luksFormat /dev/sdb1
>>
>> After that I used fdisk to create sdb1 and did
>>
>> cryptsetup -y -v luksFormat /dev/sdb1
>> cryptsetup luksOpen /dev/sdb1 prod
>>
>> and
>>
>> pv -tpreb /dev/zero | dd of=/dev/mapper/prod bs=128M
>>
>> all this I did through ssh
>>
>> but :
>>
>> 1. After a time my shell was frozen. Perhaps has ssh a timer ?
>> 2. My HDD did repetitive noises several hours (now that has stopped), even
>> after a reboot.
>>
>> So, my question please : have I to do something to erase what I did with
>>
>> cryptsetup -y -v luksFormat /dev/sdb
>>
>> And what is it ?
>>
>> Have I to do something more, or were the noises of the HDD simple my
>>
>> pv -tpreb /dev/zero | dd of=/dev/mapper/prod bs=128M
>>
>> command, even if
>>
>> ps -a | grep dd
>>
>> didn't display anything ?
>>
>>
>> Thanks, best regards,
>>
>> Amel   :)
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>
> --
> Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
> GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
> ----
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>
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