Re: Problem_wiping

Arno Wagner <[email protected]>
Newsgroups gmane.linux.kernel.device-mapper.dm-crypt
Message-ID <[email protected]>
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

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-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: [email protected]
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