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From: Arno Wagner <arno@wagner.name>
To: dm-crypt@saout.de
Subject: Re: [dm-crypt] Problem_wiping
Date: Sat, 20 Apr 2019 10:00:04 +0200	[thread overview]
Message-ID: <20190420080004.GA4461@tansi.org> (raw)
In-Reply-To: <7ce39bb6-6a83-4a70-98eb-2cc0148de230@email.android.com>

Hi,

what kind of problem do you think there is?
I do not see any. You just seem to have a slow dsk...

Regards,
Arno



On Fri, Apr 19, 2019 at 15:13:27 CEST, Dernsen wrote:
>    Hi,
>    I prepared a partition on my hdd (no ssd) as described in cryptsetup
>    FAQ (intel i3 3rd gen. ; 4gb ram):
>    Test 1. dd urandom direct on partition:
>    root@pocket-pc:/home/dernsen# dd bs=16M status=progress if=/dev/urandom
>    of=/dev/sda3
>    55566139392 Bytes (56 GB, 52 GiB) kopiert, 1611 s, 34,5 MB/s
>    dd: Fehler beim Schreiben von '/dev/sda3': Auf dem Gerät ist kein
>    Speicherplatz mehr verfügbar
>    3313+0 Datensätze ein
>    3312+0 Datensätze aus
>    55574528000 Bytes (56 GB, 52 GiB) kopiert, 1630,73 s, 34,1 MB/s
>    root@pocket-pc:/home/dernsen#
>    Test 2. dm-crypt + dd on device-mapper:
>    root@pocket-pc:/home/dernsen# cryptsetup open --type plain -d
>    /dev/urandom /dev/sda3 to_be_wiped
>    root@pocket-pc:/home/dernsen# dd bs=16M status=progress if=/dev/zero
>    of=/dev/mapper/to_be_wiped
>    55566139392 Bytes (56 GB, 52 GiB) kopiert, 1536 s, 36,2 MB/s
>    dd: Fehler beim Schreiben von '/dev/mapper/to_be_wiped': Auf dem Gerät
>    ist kein Speicherplatz mehr verfügbar
>    3313+0 Datensätze ein
>    3312+0 Datensätze aus
>    55574528000 Bytes (56 GB, 52 GiB) kopiert, 1554,81 s, 35,7 MB/s
>    root@pocket-pc:/home/dernsen#
>    There is almost no difference in speed.
>    1. Did i do any mistake?
>    2. Is this recommodation still up to date?
>    Best
>    Sebastian

> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> https://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

  reply	other threads:[~2019-04-20  8:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-19 13:13 [dm-crypt] Problem_wiping Dernsen
2019-04-20  8:00 ` Arno Wagner [this message]
2019-04-20 14:18 ` Robert Nichols
2019-04-20 17:09   ` Arno Wagner

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