Re: [dm-crypt] mistake with luksFormat

From: Arno Wagner <arno@wagner.name>
To: dm-crypt@saout.de
Subject: Re: [dm-crypt] mistake with luksFormat
Date: Sat, 23 Dec 2017 19:16:02 +0100	[thread overview]
Message-ID: <20171223181602.GA25992@tansi.org> (raw)
In-Reply-To: <20171223172211.D93E8124CA44@shakotay.alphanet.ch>

Hi Amel,

cryptsetup does nothing to the drive. 
It cannot destroy hardware.

It sounds like the disk died at the same time 
you did the overwrite by pure random chance.

Regards,
Arno

On Sat, Dec 23, 2017 at 18:22:11 CET, A. Kapetanovic wrote:
> 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   :)
> >>_______________________________________________
> >>dm-crypt mailing list
> >>dm-crypt@saout.de
> >>http://www.saout.de/mailman/listinfo/dm-crypt
> >
> >--
> >Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
> >GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
> >----
> >A good decision is based on knowledge and not on numbers. -- Plato
> >
> >If it's in the news, don't worry about it.  The very definition of
> >"news" is "something that hardly ever happens." -- Bruce Schneier
> >_______________________________________________
> >dm-crypt mailing list
> >dm-crypt@saout.de
> >http://www.saout.de/mailman/listinfo/dm-crypt
> _______________________________________________
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-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
A good decision is based on knowledge and not on numbers. -- Plato

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier