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From: Yves-Alexis Perez <corsac@debian.org>
To: Sven Eschenberg <sven@whgl.uni-frankfurt.de>, dm-crypt@saout.de
Subject: Re: [dm-crypt] Alignment issue with 4K disk
Date: Tue, 05 Jan 2016 11:14:02 +0100	[thread overview]
Message-ID: <1451988842.3914.18.camel@debian.org> (raw)
In-Reply-To: <568AFA13.2010208@whgl.uni-frankfurt.de>

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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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  reply	other threads:[~2016-01-05 10:14 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-04 21:31 [dm-crypt] Alignment issue with 4K disk Yves-Alexis Perez
2016-01-04 21:54 ` Sven Eschenberg
2016-01-04 22:20   ` Yves-Alexis Perez
2016-01-04 22:41     ` Sven Eschenberg
2016-01-04 23:02     ` Sven Eschenberg
2016-01-05 10:14       ` Yves-Alexis Perez [this message]
2016-01-07 18:00         ` .. ink ..
2016-01-09 12:30           ` Milan Broz
2016-01-09 14:47             ` Sven Eschenberg
2016-01-10  0:25 Eugen Rogoza
2016-01-10  1:14 ` Sven Eschenberg
2016-01-10  4:30   ` Sven Eschenberg
2016-01-10 15:18 Eugen Rogoza
2016-01-10 15:37 Eugen Rogoza
2016-01-10 17:22 Eugen Rogoza
2016-01-10 19:13 ` Sven Eschenberg
2016-01-10 20:20   ` Eugen Rogoza
2016-01-10 21:00     ` Sven Eschenberg

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