[dm-crypt] Alignment issue with 4K disk

.. ink .. mhogomchungu at gmail.com
Thu Jan 7 19:00:41 CET 2016


There is another (i think) related problem that was reported here[1]

Are these warnings serious or can they be ignored?


[1] https://github.com/mhogomchungu/zuluCrypt/issues/25

On Tue, Jan 5, 2016 at 1:14 PM, Yves-Alexis Perez <corsac at debian.org> wrote:
> On mar., 2016-01-05 at 00:02 +0100, Sven Eschenberg wrote:
>> Hi Alexis,
>
> (Yves-Alexis actually)
>>
>> I stumbled over this line:
>>
>> I/O size (minimum/optimal): 4096 bytes / 33553920 bytes
>>
>> The latter resembles 65535 sectors (512 Byte logical ones), which
>> explains why the automated alignment was done at sector 65535. This
>> value seems extremely weird though.
>>
>> You said the drive was external, connected how? USB maybe?
>
> Yes. It's a Samsung T3 disk, so everything is integrated (disk+sata/usb3
> adapter), not much chance I can do anything here.
>
> I'll try to force the alignment to 2048s for part1 and see what happens.
>>
>> Can you take a look at hdparm -I /dev/sdc? Anything unusual there?
>
> I'll try tonight (I don't have it at hand).
>
> Thanks for the pointers though.
> --
> Yves-Alexis
>
>
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