From: Milan Broz <mbroz@redhat.com>
To: Sven Eschenberg <sven@whgl.uni-frankfurt.de>
Cc: dm-crypt@saout.de
Subject: Re: [dm-crypt] Wrong behavior?
Date: Wed, 14 Jul 2010 14:53:02 +0200 [thread overview]
Message-ID: <4C3DB32E.7070502@redhat.com> (raw)
In-Reply-To: <1279109239.2415.10.camel@Koma-Station.localdomain>
On 07/14/2010 02:07 PM, Sven Eschenberg wrote:
> I don't see why cryptsetup does not end up with 1024 sectors (which is
> the optimal_io_size) - or is the luks header bigger than 512k? even
> bigger than 1 MB (2048 sectors) ?
yes. not header, but space for 8 keyslots.
Alignment is multiple of caclulated size - keyslot takes a lot of space.
Add --debug - you see required alignment there, then code must take
into account keyslots size.
So you have 2048s optimal IO size, I expect you are using 512bit key,
so alignment using default 4k is 4040 sectors (only space for keyslots).
So code must align to next multiple of 2048 - it is 4096.
Milan
prev parent reply other threads:[~2010-07-14 12:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-13 20:51 [dm-crypt] Wrong behavior? Sven Eschenberg
2010-07-13 21:12 ` Milan Broz
2010-07-13 22:17 ` Sven Eschenberg
[not found] ` <AANLkTilvdewwcdzdm2uX6go9q2dahLX7Fes-lwDNOkvU@mail.gmail.com>
2010-07-14 6:07 ` MkFly
2010-07-14 6:38 ` Heinz Diehl
2010-07-14 8:20 ` Milan Broz
2010-07-14 10:09 ` Arno Wagner
2010-07-14 18:09 ` Christoph Anton Mitterer
2010-07-14 7:58 ` Milan Broz
2010-07-14 11:39 ` Sven Eschenberg
2010-07-14 11:52 ` Milan Broz
2010-07-14 12:07 ` Sven Eschenberg
2010-07-14 12:13 ` Arno Wagner
2010-07-14 12:53 ` Milan Broz [this message]
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